AiGanakGPT-6.1 Terra vs Claude Sonnet 5.5: API pricing
GPT-6.1 Terra is cheaper: a typical support answer costs $0.00470 against $0.00940 on Claude Sonnet 5.5 at list prices checked 26 October 2026.
GPT-6.1 Terra: $1 input / $5 output per 1M tokens. Claude Sonnet 5.5: $2 / $10.
Prices side by side
Sources: OpenAI, Anthropic, checked 26 October 2026. Full details: GPT-6.1 Terra · Claude Sonnet 5.5.
| GPT-6.1 Terra | Claude Sonnet 5.5 | |
|---|---|---|
| Input | $1 | $2 |
| Cached input | $0.05 | $0.1 |
| Output | $5 | $10 |
| Batch input / output | $0.5 / $2.50 | $1 / $5 |
| Cache write | $1.25 | $2.50 |
| Long prompts | Prompts over 272K input tokens cost 2x input and cache rates and 1.5x output for the whole request. | No long-prompt surcharge listed |
| Announced change | None announced | None announced |
Cost per request
Token counts are stated so you can check the arithmetic.
| Task | Tokens | GPT-6.1 Terra | Claude Sonnet 5.5 |
|---|---|---|---|
| Chat reply | 2,000 input tokens, none cached, 300-token reply | $0.00350 | $0.00700 |
| Support answer | 6,000 input tokens (4,000 cached instructions and help text), 500-token answer | $0.00470 | $0.00940 |
| Document summary | 20,000-token document, no caching, 800-token summary | $0.024 | $0.048 |
Monthly cost of support answers
| Answers per month | GPT-6.1 Terra | Claude Sonnet 5.5 | Difference |
|---|---|---|---|
| 10,000 | $47.00 | $94.00 | $47.00 |
| 100,000 | $470 | $940 | $470 |
| 1,000,000 | $4,700 | $9,400 | $4,700 |
Price per token is only part of the story: the model that answers in fewer tokens, or needs fewer retries, can be cheaper in practice. Test both on your own requests before switching.
GPT-6.1 Terra vs Claude Sonnet 5.5: pricing questions
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Is GPT-6.1 Terra cheaper than Claude Sonnet 5.5?
GPT-6.1 Terra is cheaper: a typical support answer costs $0.00470 against $0.00940 on Claude Sonnet 5.5 at list prices checked 26 October 2026.
How much more does Claude Sonnet 5.5 cost than GPT-6.1 Terra?
For a support answer with 6,000 input tokens (4,000 cached) and a 500-token reply, Claude Sonnet 5.5 costs 2.0× more than GPT-6.1 Terra: $9.40 against $4.70 per 1,000 answers.
What do GPT-6.1 Terra and Claude Sonnet 5.5 cost with batch processing?
Batch prices per million tokens: GPT-6.1 Terra $0.5 input / $2.50 output, Claude Sonnet 5.5 $1 / $5. Batch requests return within 24 hours.
Should I switch from GPT-6.1 Terra to Claude Sonnet 5.5?
Only if quality holds on your own examples. Price per token is one factor; how many tokens each model uses for your task, and how often its answers need a retry, decide the real cost. Test both on 50 to 100 real requests before switching.
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