Claude Fable 5.1
Claude Fable 5.1 is Anthropic's language model with a 1.0M context window and up to 128K output tokens, starting at $5.00 / 1M input and $25.00 / 1M output. A Mythos-class LLM tuned for long-running agentic coding, knowledge work, and research tasks that run unattended for extended sessions.
Capabilities
Input2/5
Text·
Image✓
Audio·
Video·
PDF✓
Output1/5
Text✓
Image·
Audio·
Video·
Embedding·
Capabilities2/13
Reasoning✓
Adaptive Reasoning·
Function Calling✓
Parallel Function Calling·
Structured Outputs·
Native JSON Schema·
Web Search·
URL Context·
Computer Use·
Code Execution·
File Search·
Prompt Caching·
Assistant Prefill·
Pricing by Provider
US Dollar ($)
Per 1M tokens
| Provider | Standard | |||
|---|---|---|---|---|
| Input $ / 1M | Output $ / 1M | Cache Read $ / 1M | Cache Write 5m $ / 1M | |
| $5.00 | $25.00 | $0.125 | $6.25 | |
Cost Calculator
US Dollar ($)
Preset:
Versions
| Version | Released | Context | Input / 1M | Output / 1M | Status |
|---|---|---|---|---|---|
| Claude Fable 5.1 | 1.0M | $5.00 | $25.00 | Current | |
| Claude Fable 5 | 1.0M | $5.00 | $25.00 | Available | |
| Claude Fable 5 | 1.0M | $10.00 | $50.00 | Available | |
| Claude Fable 5.3 | — | — | — | — | Available |
| Claude Fable | 1.0M | $10.00 | $50.00 | Available |
Other Models
| Model | Tier | Released | Context | Input / 1M | Output / 1M |
|---|---|---|---|---|---|
| Claude Haiku 5.5 | Haiku | 1.0M | $0.100 | $0.500 | |
| Claude Haiku 5.5 Batch | Haiku | 1.0M | $0.050 | $0.250 | |
| Claude Sonnet 5.5 | Sonnet | 1.0M | $2.00 | $10.00 | |
| Claude Sonnet 5.5 Batch | Sonnet | 1.0M | $1.00 | $5.00 | |
| Claude Opus 5.5 | Opus | 1.0M | $4.00 | $20.00 | |
| Claude Opus 5.5 | Opus | 1.0M | $2.00 | $10.00 | |
| Claude Fable 5.1 | — | 1.0M | $10.00 | $50.00 | |
| Claude Opus 5 | Opus | 1.0M | $5.00 | $25.00 | |
| Claude Opus 5 | Opus | 1.0M | $2.50 | $12.50 | |
| Claude Sonnet 5 | Sonnet | 1.0M | $2.00 | $10.00 |