Claude Opus 4 vs Grok 4
A complete head-to-head: pricing, context window, benchmarks, modality coverage, and openness, with a programmatic verdict synthesized from the underlying data.
Updated
Claude Opus 4 specs · Grok 4 specs- PriceGrok 4
Grok 4 is roughly 5.0× cheaper on output tokens ($15.00 vs $75.00 per 1M).
- Context windowGrok 4
Grok 4 accepts 256K tokens vs 200K, 1.3× the room for long documents and codebases.
- BenchmarksTie
No directly comparable public benchmarks are available for both models, check the spec sheets for individual scores.
- ModalitiesTie
Both handle text, vision.
- OpennessTie
Both are closed-weight, API-only.
On balance Grok 4 edges ahead, winning 2 of 5 categories against Claude Opus 4's 0. Grok 4 is roughly 5.0× cheaper on output tokens ($15.00 vs $75.00 per 1M). Grok 4 accepts 256K tokens vs 200K, 1.3× the room for long documents and codebases.
No directly comparable public benchmarks are available for both models, check the spec sheets for individual scores. Both target the same set of modalities (text, vision), so the deciding factors are price, context, and raw quality. Both are closed-weight, API-only.
Grok 4 is the newer of the two, released 2 months after Claude Opus 4, which usually means a more recent knowledge cutoff and updated safety post-training. Claude Opus 4 is usually picked for coding llm and coding agent workloads, while Grok 4 sees more deployments in reasoning and research agent. If pricing matters more than every last benchmark point, run the numbers in the calculator below before committing.
Side-by-side specs
| Spec | Claude Opus 4 | Grok 4 |
|---|---|---|
| Provider | Anthropic | xAI |
| Released | May 2025 | Jul 2025 |
| Modalities | text, vision | text, vision |
| Context window | 200K tokens | 256K tokens |
| Max output | , | , |
| Input · 1M | $15.00 / 1M tokens | $3.00 / 1M tokens |
| Output · 1M | $75.00 / 1M tokens | $15.00 / 1M tokens |
| Knowledge cutoff | 2025-03 | 2024-11 |
| Open weights | No | No |
| API available | Yes | Yes |
Pricing at scale
What you'd actually pay at typical workloads. Numbers come from each model's published per-million-token rates.
- Light usage, 100k in / 50k out per day$158 vs $31.50
- Heavy usage, 1M in / 500k out per day$1,575 vs $315
- RAG workload, 5M in / 200k out per day$2,700 vs $540
Light usage, 100k in / 50k out per day: $158 vs $31.50 per month, model B comes out ahead. Heavy usage, 1M in / 500k out per day: $1,575 vs $315 per month, model B comes out ahead. RAG workload, 5M in / 200k out per day: $2,700 vs $540 per month, model B comes out ahead.
Estimated spend for the listed models at your usage. Numbers are derived from each model's published per-million-token rates.
- Claude Opus 4$5.25
- Grok 4$1.05
Benchmarks compared
Only sourced numbers. Where a benchmark is missing for one model we show the available value rather than fabricating the other.
- HumanEval95.0
- GPQA,87.5
- SWE-bench Verified72.5
Claude Opus 4 fits when…
- Set the SWE-bench bar at launch
- Excellent for writing and code
- Strong long-context handling
Grok 4 fits when…
- Real-time X data access
- Strong on benchmarks at launch
- Less restrictive content policy than peers
- Cost-sensitive workloads, 5.0× cheaper than Claude Opus 4 on output tokens.
Consider Claude Opus 4.7
Anthropic's mid-2026 flagship, ahead on SWE-bench, agent reliability, and writing quality.
Frequently asked
Is Claude Opus 4 or Grok 4 cheaper?
Grok 4 is cheaper at $15.00 / 1M tokens per million output tokens, vs $75.00 / 1M tokens for Claude Opus 4.Which has the larger context window?
Grok 4 accepts 256K tokens vs 200K for Claude Opus 4.Is Claude Opus 4 or Grok 4 better for coding?
Both Claude Opus 4 and Grok 4 are competitive on coding benchmarks. See each model's individual spec page for HumanEval and SWE-bench scores where published. For an opinionated pick, consult our Best LLM for Coding ranking.Are either of these models open source?
Neither model ships open weights, both are accessible only via their respective providers' APIs.When were Claude Opus 4 and Grok 4 released?
Claude Opus 4 was released by Anthropic on 2025-05-22. Grok 4 was released by xAI on 2025-07-09.
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