AiGanakGPT-6 Astra vs Claude Fable 5.1: API pricing
Claude Fable 5.1 is cheaper: a typical support answer costs $0.046 against $0.049 on GPT-6 Astra at list prices checked 26 October 2026.
GPT-6 Astra: $10 input / $50 output per 1M tokens. Claude Fable 5.1: $10 / $50.
Prices side by side
Sources: OpenAI, Anthropic, checked 26 October 2026. Full details: GPT-6 Astra · Claude Fable 5.1.
| GPT-6 Astra | Claude Fable 5.1 | |
|---|---|---|
| Input | $10 | $10 |
| Cached input | $1 | $0.25 |
| Output | $50 | $50 |
| Batch input / output | $5 / $25 | $5 / $25 |
| Cache write | $12.50 | $12.50 |
| 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 Astra | Claude Fable 5.1 |
|---|---|---|---|
| Chat reply | 2,000 input tokens, none cached, 300-token reply | $0.035 | $0.035 |
| Support answer | 6,000 input tokens (4,000 cached instructions and help text), 500-token answer | $0.049 | $0.046 |
| Document summary | 20,000-token document, no caching, 800-token summary | $0.240 | $0.240 |
Monthly cost of support answers
| Answers per month | GPT-6 Astra | Claude Fable 5.1 | Difference |
|---|---|---|---|
| 10,000 | $490 | $460 | $30.00 |
| 100,000 | $4,900 | $4,600 | $300 |
| 1,000,000 | $49,000 | $46,000 | $3,000 |
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 Astra vs Claude Fable 5.1: pricing questions
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Is GPT-6 Astra cheaper than Claude Fable 5.1?
Claude Fable 5.1 is cheaper: a typical support answer costs $0.046 against $0.049 on GPT-6 Astra at list prices checked 26 October 2026.
How much more does GPT-6 Astra cost than Claude Fable 5.1?
For a support answer with 6,000 input tokens (4,000 cached) and a 500-token reply, GPT-6 Astra costs 1.1× more than Claude Fable 5.1: $49.00 against $46.00 per 1,000 answers.
What do GPT-6 Astra and Claude Fable 5.1 cost with batch processing?
Batch prices per million tokens: GPT-6 Astra $5 input / $25 output, Claude Fable 5.1 $5 / $25. Batch requests return within 24 hours.
Should I switch from GPT-6 Astra to Claude Fable 5.1?
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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