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 code generation, and finance and analysis tasks in particular. It also tends to be more concise than Fable 5 in its plans and summaries. We recommend testing it as a direct upgrade wherever you use Fable 5 today, and alongside Opus 5 on reasoning-heavy tasks.
$5.00market price $10.00
$0.125market price $0.25
$25.00market price $50.00
Throughput is how fast the model writes (tokens per second, higher is better). Time to first token is how long before the answer starts (lower is better).
Share of requests served without a server error. Client errors (4xx) do not count.
Works with the OpenAI SDK pointed at our base URL. Every parameter is in the API reference.
Tokens processed per day on NagaAI.
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 code generation, and finance and analysis tasks in particular.
On NagaAI, Claude Fable 5.1 costs $5 per 1M input tokens and $25 per 1M output tokens. You pay only for what you use, with no subscription.
Claude Fable 5.1 reads up to 1M tokens in one request, counting the prompt and the answer together.
Yes. Claude Fable 5.1 can call your functions as tools and can answer in a JSON schema you give it.
It takes text, images and files as input and returns text.
Create an API key, copy the model ID from the top of this page and send requests with the OpenAI or Anthropic SDK pointed at NagaAI. The API section on this page has a ready example.
Claude Haiku 5.5AnthropicClaude Sonnet 5.5AnthropicClaude Opus 5.5AnthropicClaude Opus 5AnthropicClaude Sonnet 5AnthropicClaude Fable 5Anthropic