AI model comparison
GPT-6.1 Sol vs Claude Sonnet 5.5
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
OpenAI
GPT-6.1 Sol
GPT-6.1 Sol is an upgrade to GPT-6 Sol from OpenAI, positioned below the flagship GPT-6 Astra in the GPT-6 series.
- Input / 1M
- $2
- Output / 1M
- $10
- Context
- 1.05M
Anthropic
Claude Sonnet 5.5
Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade.
- Input / 1M
- $2
- Output / 1M
- $10
- Context
- 1M
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Tie
Same price for a typical chat
Higher intelligence score
Claude Sonnet 5.5
56 vs 51.8 on Artificial Analysis
Larger context window
GPT-6.1 Sol
1.05M vs 1M tokens
Newer release
GPT-6.1 Sol
Released September 29, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
GPT-6.1 Sol51.8Claude Sonnet 5.556Coding index
GPT-6.1 SolNot availableClaude Sonnet 5.5Not availableAgentic index
GPT-6.1 SolNot availableClaude Sonnet 5.5Not availablePricing
GPT-6.1 Sol vs Claude Sonnet 5.5 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | GPT-6.1 Sol | Claude Sonnet 5.5 |
|---|---|---|
| Input tokensPer 1M tokens | $2 | $2 |
| Output tokensPer 1M tokens | $10 | $10 |
| Cached input (read)Per 1M tokens | $0.10 | $0.10 |
| Cache writePer 1M tokens | $2.50 | $2.50 |
| Long-context pricingPer 1M tokens, for very long prompts | $4 in / $15 out above 272K | Same rate at any length |
| Web searchPer request | $0.01 | $0.01 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
GPT-6.1 Sol$9Claude Sonnet 5.5$9Coding task
30K in, 4K out
GPT-6.1 Sol$100$43 cachedClaude Sonnet 5.5$100$43 cachedLong document summary
150K in, 2K out
GPT-6.1 Sol$320$35 cachedClaude Sonnet 5.5$320$35 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | GPT-6.1 Sol | Claude Sonnet 5.5 |
|---|---|---|
| Context window | 1.05M tokens | 1M tokens |
| Max output | 128K tokens | 128K tokens |
| Input types | File, Image, Text | File, Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | Max, Extra high, High, Medium, Low | Max, Extra high, High, Medium, Low |
| Default reasoning effort | Medium | High |
| Release date | September 29, 2026 | September 28, 2026 |
Features
Supported features
API features available for each model.
| Metric | GPT-6.1 Sol | Claude Sonnet 5.5 |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Not supported | Not supported |
| Stop sequences | Not supported | Supported |
| Deterministic seed | Supported | Not supported |
| Verbosity control | Supported | Supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
GPT-6.1 SolView full model details- GPT-6.1 Sol vs Claude Opus 5.5
- GPT-6.1 Sol vs Claude Fable 5.1
- GPT-6.1 Sol vs GPT-6 Astra
- GPT-6.1 Sol vs Claude Opus 5
- GPT-6.1 Sol vs Claude Fable 5
- GPT-6.1 Sol vs Muse Spark 1.3
- GPT-6.1 Sol vs GPT-6 Sol
- GPT-6.1 Sol vs GPT-5.6 Sol
- GPT-6.1 Sol vs Grok 4.7
- GPT-6.1 Sol vs DeepSeek V4.1 Flash
- GPT-6.1 Sol vs GLM 5.3 Flash
- GPT-6.1 Sol vs MiMo-V2.6-Flash
- GPT-6.1 Sol vs GLM 5.3
- GPT-6.1 Sol vs Hy4 preview
- GPT-6.1 Sol vs GPT-6 Luna
- GPT-6.1 Sol vs Kimi K3
- GPT-6.1 Sol vs DeepSeek V4 Flash 0731
Claude Sonnet 5.5View full model details- Claude Sonnet 5.5 vs Claude Opus 5.5
- Claude Sonnet 5.5 vs Claude Fable 5.1
- Claude Sonnet 5.5 vs GPT-6 Astra
- Claude Sonnet 5.5 vs Claude Opus 5
- Claude Sonnet 5.5 vs Claude Fable 5
- Claude Sonnet 5.5 vs Muse Spark 1.3
- Claude Sonnet 5.5 vs GPT-6 Sol
- Claude Sonnet 5.5 vs GPT-5.6 Sol
- Claude Sonnet 5.5 vs Grok 4.7
- Claude Sonnet 5.5 vs GLM 5.3
- Claude Sonnet 5.5 vs DeepSeek V4.1 Flash
- Claude Sonnet 5.5 vs GLM 5.3 Flash
- Claude Sonnet 5.5 vs MiMo-V2.6-Flash
- Claude Sonnet 5.5 vs Hy4 preview
- Claude Sonnet 5.5 vs GPT-6 Luna
- Claude Sonnet 5.5 vs DeepSeek V4 Flash 0731
Our take
Claude Sonnet 5.5 scores higher on the Artificial Analysis Intelligence Index (56 vs 51.8). GPT-6.1 Sol has the larger context window (1.05M vs 1M tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is GPT-6.1 Sol or Claude Sonnet 5.5 cheaper?
GPT-6.1 Sol and Claude Sonnet 5.5 cost the same for a typical chat (2K input tokens and 500 output tokens). GPT-6.1 Sol costs $2 per 1M input tokens and $10 per 1M output tokens, and Claude Sonnet 5.5 costs $2 per 1M input tokens and $10 per 1M output tokens.
Which has a bigger context window, GPT-6.1 Sol or Claude Sonnet 5.5?
GPT-6.1 Sol supports up to 1.05M tokens of context, compared with 1M for Claude Sonnet 5.5.
Is GPT-6.1 Sol smarter than Claude Sonnet 5.5?
On the Artificial Analysis Intelligence Index, GPT-6.1 Sol scores 51.8 and Claude Sonnet 5.5 scores 56, putting Claude Sonnet 5.5 ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use GPT-6.1 Sol and Claude Sonnet 5.5 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see GPT-6.1 Sol and Claude Sonnet 5.5 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to GPT-6.1 Sol and Claude Sonnet 5.5 at the same time. Compare the answers side by side and keep the best one.