Claude Sonnet 5.5 vs GPT-6.1 Sol
At 10,000 requests a month of 5,000 input and 500 output tokens, GPT-6.1 Sol costs about $150 a month and Claude Sonnet 5.5 about $195, so GPT-6.1 Sol is 23% cheaper. Claude Sonnet 5.5 has a context window of 1,000,000 tokens and GPT-6.1 Sol has 1,050,000 tokens. Claude Sonnet 5.5 has no announced retirement. Anthropic says it will not retire it before Sep 28, 2027. GPT-6.1 Sol has no announced retirement. Prices checked 2026-10-21.
Prices are USD per 1M tokens, standard tier, checked 2026-10-21. Monthly cost uses the workload below.
Claude Sonnet 5.5 Anthropic
- Input per 1M
- $2.00
- Output per 1M
- $10
- Monthly cost
- $195
- $20 per 1,000 requests
- Context
- 1M
- Retirement
- Active
- Anthropic says not retired before Sep 28, 2027
- API ID:
- claude-sonnet-5-5
- Max output:
- 128K
- Inputs:
- Text, Images
- Released:
- Sep 28, 2026
- Knowledge cutoff:
- Jun 2026
GPT-6.1 Sol OpenAI
- Input per 1M
- $2.00
- Output per 1M
- $10
- Monthly cost
- $150Cheapest
- $15 per 1,000 requests
- Context
- 1.05M
- Retirement
- Active
- No retirement date listed
- API ID:
- gpt-6.1-sol
- Max output:
- 128K
- Inputs:
- Text, Images
- Released:
- Not published
- Knowledge cutoff:
- Apr 30, 2026
| Model | Input per 1M | Output per 1M | Monthly cost | Retirement | Context |
|---|---|---|---|---|---|
| Claude Sonnet 5.5 Anthropic | $2.00 | $10 | $195 $20 per 1,000 requests | Active Anthropic says not retired before Sep 28, 2027 | 1M |
| API ID: claude-sonnet-5-5Max output: 128KInputs: Text, ImagesReleased: Sep 28, 2026Knowledge cutoff: Jun 2026 | |||||
| GPT-6.1 Sol OpenAI | $2.00 | $10 | $150Cheapest $15 per 1,000 requests | Active No retirement date listed | 1.05M |
| API ID: gpt-6.1-solMax output: 128KInputs: Text, ImagesReleased: Not publishedKnowledge cutoff: Apr 30, 2026 | |||||
Monthly cost estimate
Example sizes are our round numbers. Set your own below.
Claude Sonnet 5.5 $195 a month
$20 per 1,000 requests
GPT-6.1 Sol Cheapest $150 a month
$15 per 1,000 requests
List prices checked 2026-10-21, standard tier, no caching, no batch discount. Claude 4.7 and later count about 30% more tokens for the same text, so their rows include that. Long-prompt prices apply where the vendor sets them.
The facts side by side
Each model page lists every fact with its source: Claude Sonnet 5.5 and GPT-6.1 Sol.
Prices are USD per 1M tokens, standard tier. Monthly cost is 10,000 requests of 5,000 input and 500 output tokens. Checked 2026-10-21 on each vendor's own pages.
Claude Sonnet 5.5 Anthropic
- Input per 1M
- $2.00
- Output per 1M
- $10
- Monthly cost
- $195
- $20 per 1,000 requests
- Context
- 1M
- Retirement
- Active
- Anthropic says not retired before Sep 28, 2027
- API ID:
- claude-sonnet-5-5
- Max output:
- 128K
- Inputs:
- Text, Images
- Released:
- Sep 28, 2026
- Knowledge cutoff:
- Jun 2026
GPT-6.1 Sol OpenAI
- Input per 1M
- $2.00
- Output per 1M
- $10
- Monthly cost
- $150Cheapest
- $15 per 1,000 requests
- Context
- 1.05M
- Retirement
- Active
- No retirement date listed
- API ID:
- gpt-6.1-sol
- Max output:
- 128K
- Inputs:
- Text, Images
- Released:
- Not published
- Knowledge cutoff:
- Apr 30, 2026
| Model | Input per 1M | Output per 1M | Monthly cost | Retirement | Context |
|---|---|---|---|---|---|
| Claude Sonnet 5.5 Anthropic | $2.00 | $10 | $195 $20 per 1,000 requests | Active Anthropic says not retired before Sep 28, 2027 | 1M |
| API ID: claude-sonnet-5-5Max output: 128KInputs: Text, ImagesReleased: Sep 28, 2026Knowledge cutoff: Jun 2026 | |||||
| GPT-6.1 Sol OpenAI | $2.00 | $10 | $150Cheapest $15 per 1,000 requests | Active No retirement date listed | 1.05M |
| API ID: gpt-6.1-solMax output: 128KInputs: Text, ImagesReleased: Not publishedKnowledge cutoff: Apr 30, 2026 | |||||
Benchmark scores side by side
Independent scores from Epoch AI, which scores every vendor's models the same way. Ranks compare each model with the others on our AI models page.
| Benchmark | Claude Sonnet 5.5 | GPT-6.1 Sol |
|---|---|---|
| Epoch Capabilities Index One score that combines many benchmarks, such as math, science, and coding tests, into a single scale. Epoch sets Claude 3.5 Sonnet at 130 and GPT-5 at 150. | 166.18 Rank 6 of 17 models here | 168.37 Rank 3 of 17 models here |
| GPQA Diamond 198 hard multiple-choice questions in biology, chemistry, and physics, written by PhD-level experts. Guessing scores 25%. We show the highest score for each model across the reasoning settings Epoch ran. | 95.6% Rank 3 of 16 models here | 95.4% Rank 4 of 16 models here |
Scores are Epoch AI's, not ours. Source: Epoch AI, Capabilities and benchmarking, from its public data download, checked 2026-10-21. Used under CC BY 4.0. We drew the charts. A benchmark is one test, so run your own inputs before you choose.
What each vendor says
"Near-Astra performance for complex work at a lower cost."
Want a different pair? Use the AI model compare tool, or get a shortlist for your job from the AI model picker. For older models with shutdown dates, see our AI model retirement dates calendar.
Questions clients ask
Short answers, no sales language. If yours isn't here, ask an engineer directly.
Ask us anythingWhich is cheaper, Claude Sonnet 5.5 or GPT-6.1 Sol?
They have the same list price: $2.00 in and $10 out per 1M tokens. At 10,000 requests a month of 5,000 input and 500 output tokens, Claude Sonnet 5.5 costs about $195 a month and GPT-6.1 Sol about $150. The monthly figures add about 30% to Claude 4.7 and later rows, because Anthropic says they count more tokens for the same text. Checked 2026-10-21.
Which has the larger context window?
Claude Sonnet 5.5: 1,000,000 tokens. GPT-6.1 Sol: 1,050,000 tokens.
Is either model being retired?
Claude Sonnet 5.5 has no announced retirement. Anthropic says it will not retire it before Sep 28, 2027. GPT-6.1 Sol has no announced retirement.
Which should I use?
Run 20 to 50 of your real inputs through both and compare the answers and the token counts. Price per token is only half of the cost. The other half is how many tokens each model uses for your task.
Want both tested on your data?
Send us 20 real inputs. An engineer runs them through both models and replies with the results. We bill hourly or by milestone.