Model decision surface
Compare AI models
Start with Claude Fable 5.1 and GPT-6 Astra, or choose any two current ranked language models. Compare capability evidence, price, context, provider availability, and weight access without pretending one field decides every use case.
Current public data
Claude Fable 5.1 vs GPT-6 Astra
Live dataset updated 9/9/2026, 8:18:44 PM UTC
Open 1200×630 evidence receipt| Field | Claude Fable 5.1 Anthropic | GPT-6 Astra OpenAI |
|---|---|---|
| ModelCap position | #3 | #1 |
| Index score | 87.7 | 93.7 |
| Evidence | Measured5 public benchmark observations across 5 boards | Measured4 public benchmark observations across 4 boards |
| Input / 1M | $10.00 | $10.00 |
| Output / 1M | $50.00 | $50.00 |
| Pricing status | fresh | fresh |
| Context | 1M | 1M |
| Providers | 4 | 2 |
| Weight access | API only | API only |
Decision facts
- Claude Fable 5.1 is #3; GPT-6 Astra is #1 on the same current language board.
- Index scores are 87.7 for Claude Fable 5.1 and 93.7 for GPT-6 Astra. Their published uncertainty intervals overlap, so the rank difference alone does not establish a reliable capability advantage for your workload.
- Both positions use Measured evidence.
- Listed output price per 1M tokens is $50.00 for Claude Fable 5.1 and $50.00 for GPT-6 Astra. For 1,000 requests with 2,000 input and 500 output tokens each (2M input + 0.5M output), the listed-rate estimate is $45.00 for Claude Fable 5.1 versus $45.00 for GPT-6 Astra. The listed-rate totals are equal. This excludes caching, batch discounts, prompt-length tiers, tool charges and retries; verify the selected endpoint before budgeting.
- Published context is 1,000,000 tokens for Claude Fable 5.1 and 1,050,000 for GPT-6 Astra.
- ModelCap currently lists 4 providers for Claude Fable 5.1 and 2 for GPT-6 Astra.
These are separate published fields, not a synthetic winner. ModelCap does not collapse price, access, context, and capability evidence into a hidden recommendation score.
Popular comparisons
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Each comparison page is a permanent, shareable URL with the same live figures as this tool: ModelCap Index position, API pricing, context window, provider count, weight access and every shared benchmark board.