Claude Fable 5.1 vs GPT-6 Astra: cost
For a typical support chatbot, Claude Fable 5.1 is about 1.0× cheaper than GPT-6 Astra ($681 vs $698 per month). Price is only one factor: test both on your own prompts before switching.
| Claude Fable 5.1 | GPT-6 Astra | |
|---|---|---|
| Input /1M | $10.00 | $10.00 |
| Output /1M | $50.00 | $50.00 |
| Cached input /1M | $0.25 | $1.00 |
| Batch input /1M | $5.00 | $5.00 |
| Batch output /1M | $25.00 | $25.00 |
| Context | 1,000,000 | 922,000 |
Monthly cost by workload
| Scenario (per month) | Claude Fable 5.1 | GPT-6 Astra |
|---|---|---|
| Customer support chatbot 1,000 req/day · 1,500 in · 300 out | $681 | $698 |
| RAG over documents 500 req/day · 6,000 in · 400 out | $937 | $957 |
| Agent loop (10 calls/task, 200 tasks) 2,000 req/day · 8,000 in · 500 out | $3,024 | $3,276 |
| Batch summarization 10,000 req/day · 3,000 in · 200 out · batch | $6,000 | $6,000 |