Claude Fable 5.1vsGPT-5.1 Chat
GPT-5.1 Chat is cheaper than Claude Fable 5.1 at $1.25/M vs $10/M input tokens.
| Spec | Claude Fable 5.1 | GPT-5.1 Chat |
|---|---|---|
| Input price | $10/M tokens | $1.25/M tokens |
| Output price | $50/M tokens | $10/M tokens |
| Context window | 1.0M tokens | 128K tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Sep 2026 | Nov 2025 |
Our Verdict
Claude Fable 5.1
GPT-5.1 ChatRunner-up
Not enough votes to call it. On the specs, Claude Fable 5.1 has the edge: bigger model tier, newer, bigger context window.
GPT-5.1 Chat costs 5.0x less per token.
Slight edge
API pricing
Cost per 1M tokens
Claude Fable 5.1
Input
$10.00
Output
$50.00
GPT-5.1 Chat
Input
$1.25
8.0× cheaper
Output
$10.00
5.0× cheaper
GPT-5.1 Chat is cheaper on both: 8.0× input, 5.0× output.
Where to run it
4 hosts
GPT-5.1 Chat
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 6 Sep 2026.
Research
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