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 OpenAI: GPT-5.4 Image 2
Anthropic: Claude Fable 5.1 (batch) wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
[GPT-5.4](https://openrouter.ai/openai/gpt-5.4) Image 2 combines OpenAI's GPT-5.4 model with state-of-the-art image generation capabilities from GPT Image 2. It enables rich multimodal workflows, allowing users to seamlessly move between re…
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Fable 5.1 (batch) | OpenAI: GPT-5.4 Image 2 | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1M | 272K | 🏆 Anthropic: Claude Fable 5.1 (batch) |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $5.00 | $8.00 | 🏆 Anthropic: Claude Fable 5.1 (batch) |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $25.00 | $15.00 | 🏆 OpenAI: GPT-5.4 Image 2 |
| 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 | Yes | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Anthropic: Claude Fable 5.1 (batch) better than OpenAI: GPT-5.4 Image 2?
Anthropic: Claude Fable 5.1 (batch) wins on 3 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 OpenAI: GPT-5.4 Image 2?
Input: $5.00 vs $8.00 per 1M tokens. Output: $25.00 vs $15.00 per 1M tokens.
What context windows do Anthropic: Claude Fable 5.1 (batch) and OpenAI: GPT-5.4 Image 2 support?
Anthropic: Claude Fable 5.1 (batch) supports up to 1M tokens. OpenAI: GPT-5.4 Image 2 supports up to 272K tokens.
Do both Anthropic: Claude Fable 5.1 (batch) and OpenAI: GPT-5.4 Image 2 support tool calling?
Anthropic: Claude Fable 5.1 (batch): yes. OpenAI: GPT-5.4 Image 2: not advertised.