Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...
Model details →Anthropic: Claude Fable 5.1 (batch) vs facebook/opt-125m
Anthropic: Claude Fable 5.1 (batch) wins on 6 of 6 axes — pricing and capability skew in its favour for most workloads.
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Model details →Side-by-side comparison
| Capability | Anthropic: Claude Fable 5.1 (batch) | facebook/opt-125m | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1M | Unknown | 🏆 Anthropic: Claude Fable 5.1 (batch) |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $5.00 | Custom | 🏆 Anthropic: Claude Fable 5.1 (batch) |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $25.00 | Custom | 🏆 Anthropic: Claude Fable 5.1 (batch) |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | — | 🏆 Anthropic: Claude Fable 5.1 (batch) |
| Vision input Accepts image inputs alongside text. | Yes | — | 🏆 Anthropic: Claude Fable 5.1 (batch) |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | — | 🏆 Anthropic: Claude Fable 5.1 (batch) |
Frequently asked questions
Is Anthropic: Claude Fable 5.1 (batch) better than facebook/opt-125m?
Anthropic: Claude Fable 5.1 (batch) wins on 6 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Anthropic: Claude Fable 5.1 (batch) and facebook/opt-125m?
Input: $5.00 vs Custom per 1M tokens. Output: $25.00 vs Custom per 1M tokens.
What context windows do Anthropic: Claude Fable 5.1 (batch) and facebook/opt-125m support?
Anthropic: Claude Fable 5.1 (batch) supports up to 1M tokens. facebook/opt-125m supports up to Unknown tokens.
Do both Anthropic: Claude Fable 5.1 (batch) and facebook/opt-125m support tool calling?
Anthropic: Claude Fable 5.1 (batch): yes. facebook/opt-125m: not advertised.