Compare / GPT-6.1 Sol vs Claude Opus 5.5
GPT-6.1 Sol vs Claude Opus 5.5
A side by side look at published price, context window and benchmark scores for these two models. Every number links to its source. A missing field means that model has not published a number for that metric.
What this means for your work
GPT-6.1 Sol costs half as much per token ($2 in, $10 out vs $4 and $20). Claude Opus 5.5 scores higher on the Artificial Analysis index (58 vs 52) and LMArena WebDev (1807 vs 1749). GPT-6.1 Sol was not on the LMArena Text board on this date. If you send many requests, Sol's price matters most; for web and app builds, Opus has the higher scores.
Input price
Lower is betterGPT-6.1 Sol: source Vendor pricing page, as of Oct 27, 2026. standard text input per 1M tokens; prompts over 272K input tokens are 2x input for the full request
Claude Opus 5.5: source Vendor pricing page, as of Oct 27, 2026. Claude API base input USD per 1M tokens; also stated on the Opus 5.5 model overview excerpts
Output price
Lower is betterGPT-6.1 Sol: source Vendor pricing page, as of Oct 27, 2026. standard text output per 1M tokens; prompts over 272K input tokens are 1.5x output
Claude Opus 5.5: source Vendor pricing page, as of Oct 27, 2026. Claude API base output USD per 1M tokens
Context window
Higher is betterGPT-6.1 Sol: source Vendor model page, as of Oct 27, 2026. 1,050,000 context window on the model details page
Claude Opus 5.5: source Vendor model page, as of Oct 27, 2026. 1M tokens on the Claude models comparison table
Output speed
Higher is betterGPT-6.1 Sol: source Artificial Analysis, as of Oct 27, 2026. max; OpenAI API
Claude Opus 5.5: source Artificial Analysis, as of Oct 27, 2026. max, default fallback; Anthropic API
Time to first token
Lower is betterFor reasoning settings, Artificial Analysis counts thinking time before the first answer token, so long waits are expected on max effort modes.
GPT-6.1 Sol: source Artificial Analysis, as of Oct 27, 2026. max; AA FAQ TTFT, includes thinking on this reasoning setting
Claude Opus 5.5: source Artificial Analysis, as of Oct 27, 2026. max, default fallback; AA FAQ TTFT; comparison table sets Time to First Token equal to Time to First Answer Token, so thinking is included
Artificial Analysis Intelligence Index
Higher is betterComposite of several evaluations run by Artificial Analysis at the setting shown.
GPT-6.1 Sol: source Artificial Analysis, as of Oct 27, 2026. max effort; AA index integer
Claude Opus 5.5: source Artificial Analysis, as of Oct 27, 2026. max effort, default fallback; AA index integer on the model page
LMArena Text score
Higher is betterBars start at 1300, not 0, to make differences easier to see.
Claude Opus 5.5: source LMArena Text, as of Oct 22, 2026. Reported for Claude Opus 5.5 (High).
LMArena WebDev score
Higher is betterBars start at 1300, not 0, to make differences easier to see.
GPT-6.1 Sol: source LMArena WebDev, as of Oct 23, 2026. Reported for GPT-6.1 Sol (Max).
Claude Opus 5.5: source LMArena WebDev, as of Oct 23, 2026. Reported for Claude Opus 5.5 (Max).
Humanity's Last Exam (no tools)
Higher is betterClaude Opus 5.5: source Artificial Analysis, as of Oct 27, 2026. max with fallback; AA HLE, tool usage marked off in the Intelligence Index methodology, 2158 text questions, pass@1
All metrics
| Metric | GPT-6.1 Sol | Claude Opus 5.5 |
|---|---|---|
| Input price | $2.00as of Oct 27, 2026 | $4.00as of Oct 27, 2026 |
| Output price | $10as of Oct 27, 2026 | $20as of Oct 27, 2026 |
| Context window | 1.05M tokensas of Oct 27, 2026 | 1M tokensas of Oct 27, 2026 |
| Output speed | 65.9 tok/sas of Oct 27, 2026 | 98.3 tok/sas of Oct 27, 2026 |
| Time to first token | 325.58 sas of Oct 27, 2026 | 741.38 sas of Oct 27, 2026 |
| Artificial Analysis Intelligence Index | 52 pointsas of Oct 27, 2026 | 58 pointsas of Oct 27, 2026 |
| LMArena Text score | Not published | 1516as of Oct 22, 2026 |
| LMArena WebDev score | 1749as of Oct 23, 2026 | 1807as of Oct 23, 2026 |
| Humanity's Last Exam (no tools) | Not published | 61.4%as of Oct 27, 2026 |