Claude Opus 5.5 vs Grok 4.7
Claude Opus 5.5 (2026) and Grok 4.7 (2026) are frontier-tier reasoning models from Anthropic and xAI. Claude Opus 5.5 ships a 1M-token context window, while Grok 4.7 ships a 500K-token context window. On Google-Proof Q&A, Grok 4.7 leads by 2.1 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Claude Opus 5.5 is safer overall; choose Grok 4.7 when coding workflow support matters.
Decision scorecard
Local evidence first| Signal | Claude Opus 5.5 | Grok 4.7 |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1M | 500K |
| Cheapest output | $20/1M tokens | $4.80/1M tokens |
| Provider routes | 5 tracked | 2 tracked |
| Shared benchmarks | 8 shared | Google-Proof Q&A leader |
Decision tradeoffs
- Claude Opus 5.5 holds a shared-benchmark lead on LMArena Text Arena - Creative Writing, ahead by 153 points.
- Claude Opus 5.5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Claude Opus 5.5 has broader tracked provider coverage for fallback and route flexibility.
- Local decision data tags Claude Opus 5.5 for Coding, RAG, and Agents.
- Grok 4.7 holds a shared-benchmark lead on Google-Proof Q&A, ahead by 2.1 points.
- Grok 4.7 has the lower cheapest tracked output price at $4.80/1M tokens.
- Grok 4.7 uniquely exposes Code execution in local model data.
- Local decision data tags Grok 4.7 for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Claude Opus 5.5
$8,200
Cheapest tracked route/tier: Anthropic
Grok 4.7
$2,480
Cheapest tracked route/tier: OpenRouter <200k prompt tokens (OpenRouter listed)
Estimated monthly gap: $5,720. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Grok 4.7 is $15.20/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Grok 4.7 adds Code execution in local capability data.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Claude Opus 5.5 is $15.20/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Code execution before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-09-22 | 2026-09-21 |
| Context window | 1M | 500K |
| Parameters | — | — |
| Architecture | Decoder Only | - |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Weights | Not released | Not released |
| Code | Unknown | Unknown |
| Commercial use | Restricted | Restricted |
| Knowledge cutoff | 2026-06 | 2026-05 |
Pricing and availability
| Pricing attribute | Claude Opus 5.5 | Grok 4.7 |
|---|---|---|
| Input price | $4/1M tokens |
|
| Output price | $20/1M tokens |
|
| Providers |
Capabilities
| Capability | Claude Opus 5.5 | Grok 4.7 |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | Yes |
| JSON / Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | No | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Claude Opus 5.5 | Grok 4.7 |
|---|---|---|
| Google-Proof Q&A | 90.6 | 92.7 |
| LMArena Text Arena - Creative Writing | 1534.0 | 1381.0 |
| FrontierMath Tier 4 | 95.0 | 17.1 |
| Chatbot Arena | 1509.0 | 1441.0 |
| LMArena Vision Arena | 1293.0 | 1250.0 |
| Terminal-Bench 4.0 | 64.8 | 37.6 |
| CursorBench | 57.8 | 46.3 |
| FrontierCode 1.1 Main | 54.6 | 47.6 |
Deep dive
On shared benchmark coverage, Google-Proof Q&A has Claude Opus 5.5 at 90.6 and Grok 4.7 at 92.7, with Grok 4.7 ahead by 2.1 points; LMArena Text Arena - Creative Writing has Claude Opus 5.5 at 1534 and Grok 4.7 at 1381, with Claude Opus 5.5 ahead by 153 points; FrontierMath Tier 4 has Claude Opus 5.5 at 95 and Grok 4.7 at 17.1, with Claude Opus 5.5 ahead by 77.9 points. The largest visible gap is 153 points on LMArena Text Arena - Creative Writing, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on code execution: Grok 4.7. Both models share vision, multimodal input, reasoning mode, and JSON / Tool use, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Claude Opus 5.5 lists $4/1M input and $20/1M output tokens on the cheapest listed provider, while Grok 4.7 lists tiered pricing: <200k prompt tokens (OpenRouter listed) is $1.60/1M input and $4.80/1M output; >=200k prompt tokens (OpenRouter listed) is $3.20/1M input and $9.60/1M output. A 70/30 input-output blend puts Grok 4.7 lower by about $6.24 per million blended tokens. For tiered pricing, this cheapest-route view can understate interactive or fast-lane spend, so compare the tier you will actually use. Availability is 5 providers versus 2, so concentration risk also matters.
Choose Claude Opus 5.5 when long-context analysis, larger context windows, and broader provider choice are central to the workload. Choose Grok 4.7 when coding workflow support and lower cheapest-tier input-token cost are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which has a larger context window, Claude Opus 5.5 or Grok 4.7?
Claude Opus 5.5 supports 1M tokens, while Grok 4.7 supports 500K tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Claude Opus 5.5 or Grok 4.7?
Claude Opus 5.5 lists $4/1M input and $20/1M output tokens on the cheapest listed provider. Grok 4.7 lists tiered pricing: <200k prompt tokens (OpenRouter listed) is $1.60/1M input and $4.80/1M output; >=200k prompt tokens (OpenRouter listed) is $3.20/1M input and $9.60/1M output. Compare the tier you will actually use; cheap async pricing can overstate savings for interactive workflows. Provider discounts or batch pricing can still change the final bill.
Is Claude Opus 5.5 or Grok 4.7 open source?
Claude Opus 5.5 is listed under Proprietary. Grok 4.7 is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Claude Opus 5.5 or Grok 4.7?
Both Claude Opus 5.5 and Grok 4.7 expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is better for multimodal input, Claude Opus 5.5 or Grok 4.7?
Both Claude Opus 5.5 and Grok 4.7 expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Where can I run Claude Opus 5.5 and Grok 4.7?
Claude Opus 5.5 is available on Anthropic, AWS Bedrock, GCP Vertex AI, Microsoft Foundry, and OpenRouter. Grok 4.7 is available on xAI Console and OpenRouter. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-10-16. Data sourced from public model cards and provider documentation.