Claude Opus 4.6 vs GPT-5.5
Claude Opus 4.6 (2026) and GPT-5.5 (2026) are frontier-tier reasoning models from Anthropic and OpenAI. Claude Opus 4.6 ships a 1M-token context window, while GPT-5.5 ships a 1M-token context window. On Google-Proof Q&A, GPT-5.5 leads by 9.4 pts. On pricing, Claude Opus 4.6 costs $5/1M input tokens versus $5/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Pick GPT-5.5 for reasoning; Claude Opus 4.6 is better when coding workflow support matters more.
Specs
| Released | 2026-02-05 | 2026-04-23 |
| Context window | 1M | 1M |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2025-12 | - |
Pricing and availability
| Claude Opus 4.6 | GPT-5.5 | |
|---|---|---|
| Input price | $5/1M tokens | $5/1M tokens |
| Output price | $25/1M tokens | $30/1M tokens |
| Providers |
Capabilities
| Claude Opus 4.6 | GPT-5.5 | |
|---|---|---|
| Vision | ||
| Multimodal | ||
| Reasoning | ||
| Function calling | ||
| Tool use | ||
| Structured outputs | ||
| Code execution |
Benchmarks
| Benchmark | Claude Opus 4.6 | GPT-5.5 |
|---|---|---|
| Google-Proof Q&A | 84.2 | 93.6 |
| SWE-bench Pro | 45.2 | 58.6 |
Deep dive
On shared benchmark coverage, Google-Proof Q&A has Claude Opus 4.6 at 84.2 and GPT-5.5 at 93.6, with GPT-5.5 ahead by 9.4 points; SWE-bench Pro has Claude Opus 4.6 at 45.2 and GPT-5.5 at 58.6, with GPT-5.5 ahead by 13.4 points. The largest visible gap is 13.4 points on SWE-bench Pro, 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 is close: both models cover vision, multimodal input, reasoning mode, function calling, and tool use. That makes context budget, benchmark fit, and provider maturity more important than a simple checklist. If your application depends on one integration detail, verify it against the provider route you plan to use, not just the base model listing.
For cost, Claude Opus 4.6 lists $5/1M input and $25/1M output tokens, while GPT-5.5 lists $5/1M input and $30/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Claude Opus 4.6 lower by about $1.5 per million blended tokens. Availability is 4 providers versus 1, so concentration risk also matters.
Choose Claude Opus 4.6 when coding workflow support and broader provider choice are central to the workload. Choose GPT-5.5 when coding workflow support 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 4.6 or GPT-5.5?
Claude Opus 4.6 supports 1M tokens, while GPT-5.5 supports 1M 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 4.6 or GPT-5.5?
Claude Opus 4.6 is cheaper on tracked token pricing. Claude Opus 4.6 costs $5/1M input and $25/1M output tokens. GPT-5.5 costs $5/1M input and $30/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Claude Opus 4.6 or GPT-5.5 open source?
Claude Opus 4.6 is listed under Proprietary. GPT-5.5 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 4.6 or GPT-5.5?
Both Claude Opus 4.6 and GPT-5.5 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 4.6 or GPT-5.5?
Both Claude Opus 4.6 and GPT-5.5 expose multimodal input. 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.
Where can I run Claude Opus 4.6 and GPT-5.5?
Claude Opus 4.6 is available on OpenRouter, Anthropic, AWS Bedrock, and GCP Vertex AI. GPT-5.5 is available on OpenAI API. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-04-24. Data sourced from public model cards and provider documentation.