Claude Opus 5.5 vs GPT-6.1 Sol
| Benchmark | Opus 5.5 | GPT-6.1 Sol |
|---|---|---|
| AutomationBench-AA | 61.2 | 62.6 |
| GDPval-AA (work tasks) 2.1 | 54.2 | 47.5 |
| AA Analyst Agent | 56.3 · max | 50 · max |
| Terminal-Bench 4.0 | 52.5 | 48 |
| Terminal-Bench Science 0.1 | 43.3 | 58.1 · max |
| AA-Briefcase 1.1 · Elo | 1,625.1 | 1,361.2 |
| AA-LCR (long context) 1.1 | 84.3 | 83.3 |
| DeepSWE 1.1 | 72.3 · max | 72.3 · max |
| FrontierCode 1.1 | 57.1 | 49.1 · max |
| Harvey LAB-AA 1.1 | 4.2 · max | 6.9 · max |
| EBR Bench | 71.4 · max | 54.3 · max |
| Furniture Assembly | 83.3 · max | 80 · max |
| SpireClimb | 3.3 · max | 24.7 · max |
| SpireClimb StS1 A20 Heart | 0 · max | 20 · max |
| SpireClimb StS2 A10 | 6.7 · max | 29.3 · max |
| ITBench SRE | 38.2 · max | — |
| SWE-bench Pro (v2 full) | — | 96.1 · xhigh |
Specs
| Spec | Opus 5.5 | GPT-6.1 Sol |
|---|---|---|
| Input, per 1M | $4 | $2 |
| Output, per 1M | $20 | $10 |
| Cost per task? | $1.34 | $0.21 |
| Speed, tok/s | 81 | 45 |
| Context | 1M | 1.05M |
| Weights | Closed | Closed |
| Released | Sep 2026 | Sep 2026 |
| See images | ✓ | ✓ |
| Read PDFs | ✓ | Partial |
| Hear audio | — | — |
| Watch video | — | — |
| Call tools | ✓ | ✓ |
| Force a tool call | — | Partial |
| Return strict JSON | ✓ | ✓ |
| Search the web | ✓ | ✓ |
| Run code | ✓ | ✓ |
| Use a computer | ✓ | ✓ |
What breaks when you switch
Remove unsupported parameters›
With reasoning enabled, remove temperature, top_p and top_logprobs, plus Chat Completions logprobs or Responses message.output_text.logprobs includes.
Responses API for tool calling · Chat Completions›
Use Responses for tools; Chat Completions supports this model without tool calling.
No none or minimal reasoning›
The none and minimal reasoning efforts are unsupported; choose low, medium, high, xhigh or max.
More than 272K input tokens›
Prompts above 272K input tokens charge 2× input and cache rates and 1.5× output rates for the entire request.
Cache writes billed at 1.25x›
Cache writes cost 1.25× the uncached input token rate.
Ultrafast prices 6x Standard›
Ultrafast mode costs 6× Standard token prices.
Context: 1.05M → 1M
No forced tool use›
Forced tool_choice any or tool returns HTTP 400; remove the forced choice.
Thinking is always on›
Disabled thinking or a manual budget returns HTTP 400; omit thinking or use adaptive thinking.
Remove sampling parameters›
Non-default temperature, top_p or top_k returns HTTP 400; omit these parameters and use prompting.
No assistant prefill›
Assistant prefill returns HTTP 400; use structured outputs or system instructions, with system instructions on Bedrock.
Old computer tool rejected · Claude API / Google Cloud›
The computer_20251124 tool returns HTTP 400 on the Claude API and Google Cloud; use computer_toolset_20260801 there.
Return thinking blocks unmodified›
Edited, reordered or partially dropped thinking blocks return HTTP 400; echo assistant messages complete and unmodified with tool results.