Claude Opus 5.5 vs GPT-6.1 Sol
Pick two to four models to compare benchmark scores, prices, context windows and speed. The link updates as you pick, so you can share the exact comparison.
Cheapest blended
GPT-6.1 Sol
$4.00 / 1M tokens
Largest context
GPT-6.1 Sol
1.05M tokens
Fastest output
Claude Opus 5.5
93 tokens/s
Top on AutomationBench
Claude Opus 5.5
40%
Specifications
| Spec | Claude Opus 5.5Anthropic | GPT-6.1 SolOpenAI |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Released | 22 Sep 2026 | 29 Sep 2026 |
| Licence | Proprietary | Proprietary |
| Context window | 1M tokens | 1.05M tokens |
| Max output | 128K tokens | 128K tokens |
| Input / 1M | $4.00* | $2.00* |
| Output / 1M | $20.00 | $10.00 |
| Cached input / 1M | $0.20 | $0.10 |
| Speed | 93 tokens/s | 64 tokens/s |
| Input types | text, image | text, image |
| Best for | CodingAgentsReasoningLong context | CodingAgentsReasoning |
* Claude Opus 5.5: 20% cheaper per token than Opus 5 ($5/$25). Cache reads are 0.05x base input ($0.20). Fast mode (research preview, Claude API only): $8 input / $40 output. Uses the newer tokenizer (about 30% more tokens than pre-Opus 4.7 models). Safety classifiers can refuse; since 24 Sep 2026 some pre-output refusal categories are billed. Minimum cacheable prompt: 512 tokens.
* GPT-6.1 Sol: Cache reads are 0.05x input (95% off), not the usual 0.1x. Cache writes 1.25x input. Batch and Flex: $1 / $5. Fast mode: $4 / $20. OpenAI says an Ultrafast option is coming 'in the coming days'; it is not on the pricing page yet. Data residency +10%.
Benchmark scores
Officially reported scores only. A model with no published score on a benchmark shows a line, not a zero.
Price per 1M tokens
Context window and speed
Notes
- Claude Opus 5.5
- Anthropic's recommended starting model for most workloads, built for long-running agentic coding and knowledge work. Anthropic says it performs at the level of Claude Fable 5.1 on most work at lower cost.
- GPT-6.1 Sol
- An upgrade to GPT-6 Sol that OpenAI says nearly matches GPT-6 Astra on agentic coding, computer use and professional work at one-fifth of Astra's standard token prices.
Still torn between two?
Test them on your own prompts.
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