Anthropic model

Claude Fable 5.1

Claude Fable 5.1 is a Anthropic model listed in the NextModel catalog for image understanding, multimodal chat workloads. Its listed price is $10 / 1M tokens input and $50 / 1M tokens output, with a 1M token context window.

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AnthropicPlatform curatedCatalog
StreamingTool callingJSON modeVisionLong context
Input price$10 / 1M tokens
Output price$50 / 1M tokens
Context length1M tokens
Max output8.2k tokens

What is Claude Fable 5.1 in NextModel?

Claude Fable 5.1 is a Anthropic model listed in the NextModel catalog for image understanding, multimodal chat workloads. Its listed price is $10 / 1M tokens input and $50 / 1M tokens output, with a 1M token context window.

面向长周期 Agent、大型代码工程、多步科研推理、重度知识工作的前沿大模型，在 Fable5 基础上重点强化长时间自主任务稳定性、工具调用、科学数学推理、代码全库开发能力，支持多小时持续 Agent 会话，具备自我校验纠错能力。

Best use cases

  • image understanding
  • multimodal chat

OpenAI-compatible code example

request.sh
curl https://api.nextmodel.app/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $NEXTMODEL_API_KEY" \
  -d '{"model":"anthropic/claude-fable-5.1","messages":[{"role":"user","content":"Reply with OK."}]}'

Switching models only changes the model field.

Try it in the playground

Similar alternatives

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$1 / 1M tokensInput$5 / 1M tokensOutput200kContext
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RoutingConfigured
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Anthropic Claude 4.5 Opus，强大推理能力。支持最高 1M token 上下文窗口（特殊模式），擅长处理整个代码库、长文档和多日对话历史。扩展思考模式下可进行深度推理。

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RoutingConfigured
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Platform curatedNextModel gateway catalog (Go origin)
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Claude Opus 4.6

Opus 4.6 is Anthropic’s strongest model for coding and long-running professional tasks. It is built for agents that operate across entire workflows rather than single prompts, making it especially effective...

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Best forimage understanding, multimodal chat
RoutingConfigured
StreamingTool callingJSON modeVision
Platform curatedNextModel gateway catalog (Go origin)
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Compare Claude Fable 5.1

Claude Fable 5.1 vs Claude Haiku 4.5Claude Fable 5.1 vs Claude Opus 4.5Claude Fable 5.1 vs Claude Opus 4.6Claude Fable 5.1 vs Claude Sonnet 4.5Claude Fable 5.1 vs Claude Sonnet 4.6

Reading

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FAQ

Claude Fable 5.1 API questions