Comparison
ChatGPT vs Grok
ChatGPT vs Grok in 2026 — how OpenAI's and xAI's flagship assistants compare on intelligence, coding, writing, real-time data, pricing, safety and ecosystem, and which one to choose.
Quick answer: For most people, ChatGPT is the better all-rounder — it has the broadest feature set, the deepest ecosystem, the most mature agents and a much stronger safety and enterprise record, running GPT-5.5 on paid tiers. Grok is the better pick for real-time X (Twitter) data, cheap high-volume API reasoning, native video understanding and a direct, lightly filtered personality: it runs Grok 4.3, costs about a quarter of ChatGPT’s API price, and adds voice companions no major rival ships. Both have a free tier. ChatGPT’s cheapest paid tier is $8/month (Go) and flagship reasoning starts at $20/month (Plus); Grok’s flagship is reachable at $10/month (SuperGrok Lite). Pick ChatGPT if you want one polished do-everything assistant with enterprise-grade compliance; pick Grok if you want live social data, the cheapest frontier-adjacent API, or a looser assistant. Two caveats worth knowing: ChatGPT shows ads on its Free and Go tiers in the US, while Grok carries a 2026 deepfake and child-safety scandal and lacks the enterprise certifications ChatGPT holds.
At a glance
| ChatGPT | Grok | |
|---|---|---|
| Maker | OpenAI | xAI (a SpaceX subsidiary) |
| Paid model | GPT-5.5 | Grok 4.3 |
| Free model | GPT-5.5 Instant | Grok 4-class |
| Cheapest paid | Go $8 | SuperGrok Lite $10 |
| Flagship access | Plus $20 | SuperGrok Lite $10 |
| Premium | Pro $200 | SuperGrok Heavy $300 |
| Ads | Yes — Free & Go, US only | No in-app (X itself is ad-supported) |
| Best at | Breadth, ecosystem, agents, safety | Real-time X data, API price, video input, personality |
| Image generation | Yes | Yes (paid only) |
| Video generation | Yes (Sora) | Yes (Grok Imagine) |
| Voice | Yes | Yes, plus AI companions (Ani, Valentine) |
| Web search | Yes (Search, Deep Research) | Yes (DeepSearch plus live X) |
| Agents / tasks | Yes (Agent Mode, Codex) | Yes (DeepSearch agent) |
| Real-time social data | No | Yes (X) |
| Custom bots | Custom GPTs (3M+) | No |
| Enterprise certifications | SOC 2 Type 2, ISO 27001 family | None |
| In-app context | Up to ~400K tokens | 1M (2M-token variants) |
| Users | ~1B monthly / 900M weekly | ~117M monthly |
The models behind them
On paid tiers, ChatGPT runs GPT-5.5 (launched 23 April 2026) and Grok runs Grok 4.3 (17 April 2026 in the apps, 30 April 2026 on the API). These are the two generally available flagships you can actually use today. Both makers have a newer model in the wings that has not shipped widely: OpenAI’s GPT-5.6 “Sol” entered limited preview on 26 June 2026, and xAI is training Grok 5 on its Colossus 2 supercomputer, so GPT-5.5 and Grok 4.3 remain the flagships that matter for this comparison.
The cleanest cross-vendor signal is the independent Artificial Analysis Intelligence Index, and here GPT-5.5 edges ahead: it scores 55 versus Grok 4.3’s 53.2. That gap is real but modest — Grok 4.3 sits mid-pack among current flagships rather than at the very top, while GPT-5.5 briefly held the overall lead at its launch before Claude Opus 4.8 retook it. The two models have different shapes: GPT-5.5 is the stronger generalist and agentic coder, while Grok 4.3 is a cheap, science-heavy reasoning model with native video input.
Here is how the two usable flagships compare on headline benchmarks:
| Benchmark | GPT-5.5 | Grok 4.3 | Edge |
|---|---|---|---|
| AA Intelligence Index (independent) | 55 | 53.2 | GPT-5.5 |
| GPQA Diamond (science) | 93.6% | 90.1% | GPT-5.5 (close) |
| Humanity’s Last Exam (no tools) | 41.4% | 35.0% | GPT-5.5 |
| SWE-bench Verified (coding) | 82.6% (independent) | Not disclosed | GPT-5.5 |
| SWE-bench Pro (hard coding) | 58.6% | Not disclosed (xAI concedes it trails) | GPT-5.5 |
| Context window (API) | ~1.05M tokens | 1M tokens | Tie |
| API price (input / output, per 1M) | $5 / $30 | $1.25 / $2.50 | Grok |
Two accuracy notes. GPT-5.5’s SWE-bench Verified figure of 82.6% is an independent measurement (vals.ai); a widely repeated “88.7%” SWE-bench Verified score for GPT-5.5 is not from any independent evaluator and should not be relied on. xAI, for its part, has not published SWE-bench Verified or Pro numbers for Grok 4.3 at all, and concedes the model trails Claude Opus 4.7 on agentic coding (SWE-bench Pro) by double-digit points — so its coding standing is left as data not available rather than estimated (Artificial Analysis). Vendor-run numbers are a ceiling; standardised leaderboards are a floor. For where every model ranks, see best AI models.
Pricing
Grok is the cheaper option, at both ends. In the apps, ChatGPT’s entry paid tier is Plus at $20/month, with a cheaper $8 Go tier below it; Grok’s flagship, Grok 4.3, is reachable on SuperGrok Lite at $10/month, with the fuller SuperGrok at $30/month. So the cheapest way to reach each maker’s flagship reasoning model is $20 on ChatGPT (Plus) versus $10 on Grok (SuperGrok Lite). At the top, ChatGPT Pro is $200/month and Grok’s SuperGrok Heavy is $300/month (adding the multi-agent Grok 4 Heavy).
On the API the gap is wider. Grok 4.3 costs $1.25 / $2.50 per million input/output tokens, against $5 / $30 for GPT-5.5 — Grok is roughly a quarter of the price, and one of the cheapest frontier-adjacent models available. The main caveat is Grok’s long-context cost cliff: requests over 200,000 input tokens are billed at double the standard rate ($2.50 / $5.00). GPT-5.5’s counter is token efficiency — independent testing named it the cost-efficiency leader at about $6 per task because it uses fewer output tokens to reach an answer — but on raw per-token price, Grok wins clearly.
The free tiers diverge on model and on ads. ChatGPT free runs GPT-5.5 Instant (the fast default rolled out to all tiers on 5 May 2026), whereas Grok free runs older Grok 4-class models, not the 4.3 flagship, and no longer includes image generation. Since February 2026, ChatGPT shows ads on its Free and Go tiers (currently US-only), as labelled “Sponsored” boxes; its paid tiers stay ad-free. Grok’s standalone app shows no ads, though it is tied to X, which is ad-supported. For a stronger free model, ChatGPT’s GPT-5.5 Instant is ahead; for a cheap paid on-ramp to a flagship, Grok’s $10 SuperGrok Lite is the better value.
Intelligence and reasoning
The two are close on knowledge, with GPT-5.5 ahead on the hardest reasoning. On graduate-level science they are within a few points — GPT-5.5 posts 93.6% on GPQA Diamond (OpenAI-reported) and Grok 4.3 posts 90.1% (Artificial Analysis), though the harnesses differ, so treat that as a near-tie. On the harder, tools-off Humanity’s Last Exam, GPT-5.5 leads 41.4% to 35.0%, and on the aggregate Artificial Analysis Intelligence Index it edges Grok 4.3 55 to 53.2.
Grok 4.3’s genuine strength is science and analysis at low cost: it is a reasoning model that punches above its price on GPQA-style questions and posts a field-leading 97.7% on τ²-Bench (a tool-use benchmark, xAI-reported). Its trade-off is latency — as a reasoning model it has a slow time-to-first-token of around 12 seconds — and a mid-pack overall intelligence ranking. For everyday reasoning you will not notice a gap; for the hardest abstract and knowledge tasks, GPT-5.5 is the stronger model, while Grok 4.3 offers most of the capability for a fraction of the price.
Coding
GPT-5.5 is clearly the stronger coder. It leads agentic and terminal software-engineering benchmarks — 82.7% on Terminal-Bench 2.0 and 58.6% on SWE-bench Pro (both OpenAI-reported) — and independent testing (vals.ai) measured 82.6% on SWE-bench Verified. Paired with OpenAI’s Codex agent, which reads and writes local files, runs shell commands and opens GitHub pull requests, GPT-5.5 is a strong setup for real production coding.
Grok 4.3 is capable but not class-leading, and it is unverified. xAI has not published SWE-bench Verified or Pro scores for Grok 4.3, and concedes the model trails Claude Opus 4.7 on agentic coding by double-digit points. xAI’s edge is cost and tooling reach: the cheap Grok Code Fast variant is popular for high-volume agentic coding via the API, and SpaceX’s June 2026 agreement to acquire Cursor pushes Grok deeper into developer tools. But if code quality is the priority, GPT-5.5 (and, above both, Claude Opus 4.8 at 88.6% SWE-bench Verified) are the stronger choices. Full detail in best AI for coding.
Writing and creative work
ChatGPT is the more rounded writing tool; Grok is the more unfiltered one. ChatGPT is widely rated among the most natural writers for creative and editorial work, and its Canvas workspace, memory and custom GPTs make it easy to keep a consistent voice across long projects. Its guardrails are firmer, which most users want but some find restrictive.
Grok’s writing pitch is its direct, lightly filtered personality: it answers with less hedging and moralising than rivals, which many users prefer for punchy, opinionated or irreverent copy, and its voice mode ships distinct personalities (Unhinged, Genius, Zen Master). That looseness is a double-edged sword — it is part of why Grok’s image tools ran into serious trouble (see Privacy and safety). For polished, reliable prose and long-form structure, ChatGPT is the safer tool; for a blunter voice with fewer refusals, Grok stands out.
Features and ecosystem
ChatGPT has by far the deeper ecosystem. It offers native image generation, Sora video, real-time Advanced Voice, Deep Research, an autonomous Agent Mode, Codex, persistent memory, Canvas, Projects, Connectors and more than three million Custom GPTs, across web, iOS, Android, macOS and Windows. With around a billion monthly users, it also has the widest third-party integration catalogue of any assistant. If you want one app that does everything and plugs into everything, ChatGPT is the obvious pick.
Grok’s feature set is narrower but has three things ChatGPT does not. First, real-time X (Twitter) data: Grok can read live posts, trends and sentiment, which no rival can access directly, and its DeepSearch research agent returns cited reports in under a minute where ChatGPT’s Deep Research can take 5–30 minutes. Second, native video input: Grok 4.3 can take video clips and transcribe speech, segment speakers and reason about motion, where GPT-5.5 accepts only text and images. Third, voice companions — the persistent animated characters Ani and Valentine — which have no equivalent on ChatGPT. Grok also generates images (Aurora) and short video (Grok Imagine), but only on paid tiers. It has no custom-bot marketplace, no dedicated desktop app, and a far smaller integration ecosystem.
Real-time data and platform reach
This is Grok’s signature advantage and ChatGPT’s blind spot. Because xAI owns X, Grok has direct, live access to the platform’s posts and sentiment, plus a Polymarket integration for prediction-market data — genuinely useful for news, trend-tracking and “what are people saying right now” queries. ChatGPT can browse the web and cite sources, but it cannot read X’s live firehose the way Grok can. Grok is also embedded in places ChatGPT is not, including the X app and Tesla vehicles.
ChatGPT’s counter is sheer reach and integration depth. At roughly 900 million weekly and over a billion monthly users, against Grok’s ~117 million monthly, it has the larger community, more tutorials and templates, and connectors into Gmail, Calendar, Drive, GitHub, SharePoint and more. If your workflow runs through mainstream productivity tools, ChatGPT removes more friction; if your workflow runs through social and real-time information, Grok does.
Privacy and safety
This is the sharpest divide between the two. For consumer tiers, both providers may use your conversations to train their models by default, with an opt-out in settings, and both exclude training for business and API use — so the data-training defaults are broadly similar. The difference is everything around them.
ChatGPT is the more credentialed and safety-forward option: it holds SOC 2 Type 2 and the ISO 27001 family of certifications, offers Enterprise Key Management and data-residency options, and has a mature safety track record. Its main consumer downsides are ads on the lower US tiers and a court order (in the New York Times copyright case) requiring it to retain certain logs.
Grok carries materially more risk. It holds no SOC 2 or ISO certifications, publishes thinner safety documentation than its peers, and is defined in 2026 by a deepfake and child-safety scandal: Grok’s image tools were used to generate non-consensual sexualised images of real people, including minors, prompting investigations by US state attorneys general, blocks in some countries, lawsuits and an Apple App Store warning (CNN). xAI restricted image generation to paying subscribers and removed it from the free tier in response. For anyone handling sensitive material, or any organisation with compliance requirements, ChatGPT is the safer choice by a wide margin; for individuals who prioritise a looser, less-moderated assistant, Grok’s positioning is deliberate.
Choose ChatGPT if…
- You want one polished app for everything — image, Sora video, voice, agents, custom GPTs and research.
- You need enterprise-grade compliance and safety — SOC 2, the ISO 27001 family, data residency and a stronger safety record.
- You value the broadest ecosystem and the strongest agentic coding via Codex and GPT-5.5.
Choose Grok if…
- You want real-time X (Twitter) data and fast, cited research through DeepSearch.
- You want the cheapest frontier-adjacent API ($1.25 / $2.50 per million tokens) or the cheapest paid route to a flagship ($10 SuperGrok Lite).
- You want native video understanding, a direct, lightly filtered personality, or the Ani and Valentine voice companions.
Frequently asked questions
Is ChatGPT or Grok better?
It depends on the job. ChatGPT is the better all-rounder — the broadest features, the deepest ecosystem, the most mature agents, and a much stronger safety and enterprise record, running GPT-5.5. Grok is better for real-time X data, cheap high-volume API reasoning, native video input and a direct personality, running Grok 4.3. For a polished do-everything assistant, choose ChatGPT; for live social data, the cheapest API or a looser assistant, choose Grok.
Is ChatGPT or Grok cheaper?
Grok is cheaper. On the API, Grok 4.3 is $1.25 / $2.50 per million input/output tokens versus $5 / $30 for GPT-5.5 — about a quarter of the price. In the apps, Grok’s flagship is reachable on SuperGrok Lite at $10/month, whereas ChatGPT’s flagship reasoning starts at Plus ($20/month), though ChatGPT has a cheaper $8 Go tier that runs older models. ChatGPT’s free tier does run a stronger model (GPT-5.5 Instant) than Grok’s free Grok 4-class access.
Which is better for coding?
ChatGPT. GPT-5.5 leads agentic and terminal coding (82.7% Terminal-Bench 2.0, 58.6% SWE-bench Pro) and scores 82.6% on independent SWE-bench Verified, and pairs with the Codex agent. xAI has not published SWE-bench scores for Grok 4.3 and concedes it trails on agentic coding. For the strongest code quality overall, Claude Opus 4.8 leads the field. See best AI for coding.
Can Grok see what’s happening on X?
Yes. Real-time access to X (Twitter) posts, trends and sentiment is Grok’s signature advantage, because xAI owns X. ChatGPT can browse the web and cite sources, but it cannot read X’s live data directly the way Grok can.
Does ChatGPT or Grok show ads?
ChatGPT shows labelled “Sponsored” ads on its Free and Go tiers in the US (since February 2026); its paid Plus, Pro, Business and Enterprise tiers are ad-free. Grok’s standalone app shows no ads, though it is tied to X, which is an ad-supported platform.
Which has the bigger context window?
They are close. Grok 4.3 handles 1M tokens (with 2M-token variants), while GPT-5.5 handles about 1.05M tokens via the API (400K in Codex). In the ChatGPT app the working context is smaller, up to roughly 400K on the top tier, so Grok generally offers more usable context for very long documents — but note Grok bills requests over 200,000 input tokens at double the standard rate.
Is Grok safe to use for work?
It depends on your requirements. Grok holds no SOC 2 or ISO certifications, publishes thin safety documentation, and was at the centre of a 2026 deepfake and child-safety scandal that drew regulatory action and lawsuits. For enterprise or compliance-sensitive use, ChatGPT — which holds SOC 2 Type 2 and the ISO 27001 family and offers data-residency options — is the safer choice.
Does Grok have a newer model than Grok 4.3?
Not in general release. Grok 4.3 (April 2026) is xAI’s current flagship, and Grok 5 is in training on the Colossus 2 supercomputer, projected for the second or third quarter of 2026. OpenAI is in a similar position: GPT-5.6 “Sol” entered limited preview on 26 June 2026, so GPT-5.5 remains ChatGPT’s generally available flagship.