OpenAI
GPT-6.1 Sol
$4.00 / 1M tokens
cheapest at OpenAI · $2.00 in · $10.00 out
Wins 2 of 4
Head to head · prices updated Oct 31, 2026
GPT-6.1 Sol vs Claude Opus 5.5
Claude Opus 5.5 costs 2.0× as much as GPT-6.1 Sol at their cheapest providers (blended 3 input : 1 output tokens).
Anthropic Claude
Claude Opus 5.5
$8.00 / 1M tokens
cheapest at Anthropic · $4.00 in · $20.00 out
Wins 1 of 4
- Lower priceGPT-6.1 Sol
- Higher accuracy (GPQA)GPT-6.1 Sol
- Longer contextTie
- More providersClaude Opus 5.5
Verdict
GPT-6.1 Sol is the better deal on price
Claude Opus 5.5 costs 2.0× as much as GPT-6.1 Sol at their cheapest providers (blended 3 input : 1 output tokens).
GPT-6.1 Sol scores higher on GPQA Diamond: 95.4% (max reasoning) vs 90.6% (max reasoning).
GPT-6.1 Sol wins on both price and accuracy here.
Your monthly bill
What would each cost you?
GPT-6.1 Sol saves you $40.00 a month ($480.00 a year) for this workload.
Side by side
| GPT-6.1 Sol | Claude Opus 5.5 | |
|---|---|---|
| Cheapest blended price / 1M | $4.00 | $8.00 |
| Input / output per 1M | $2.00 / $10.00 | $4.00 / $20.00 |
| Accuracy (GPQA Diamond) | 95.4% (max reasoning) | 90.6% (max reasoning) |
| Max context | 1M | 1M |
| Providers we track | 3 | 4 |
Standard list prices at each model's cheapest provider we track; blended = 3 input : 1 output tokens. GPQA Diamond from Epoch AI (CC BY 4.0), best measured reasoning setting, named next to each score. Methodology.
Where to buy each one
Questions people ask
Is GPT-6.1 Sol cheaper than Claude Opus 5.5?
Claude Opus 5.5 costs 2.0× as much as GPT-6.1 Sol at their cheapest providers (blended 3 input : 1 output tokens).
Which is more accurate, GPT-6.1 Sol or Claude Opus 5.5?
On GPQA Diamond (graduate-level science questions, measured by Epoch AI) GPT-6.1 Sol scores 95.4% (max reasoning) and Claude Opus 5.5 90.6% (max reasoning). One benchmark is not the whole picture; test both on your own prompts.
How much does GPT-6.1 Sol cost per 1M tokens?
From $2.00 input and $10.00 output per 1M tokens at OpenAI, the cheapest of 3 providers we track.
How much does Claude Opus 5.5 cost per 1M tokens?
From $4.00 input and $20.00 output per 1M tokens at Anthropic, the cheapest of 4 providers we track.
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