LLM Comparison
Claude Fable 5 vs Claude Fable 5.1
Side-by-side specs, pricing & capabilities
Price vs Intelligence
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2/6 models| Organization | ||
| OpenTools Score | 88 2.9 | 98 3.3 |
| Family | Claude Fable | Claude Fable |
| Status | Current | Current |
| Release Date | Jun 2026 | Sep 2026 |
| Context Window | 1.0M tokens | 1.0M tokens |
| Input Price | $10.00/M tokens | $10.00/M tokens |
| Output Price | $50.00/M tokens | $50.00/M tokens |
| Pricing Notes | Claude Fable 5 is priced at $10 per million input tokens and $50 per million output tokens; prompt caching and US-only inference have separate rates. | Anthropic lists $10 per million input tokens and $50 per million output tokens. Cache reads cost $0.25 per million tokens, 5-minute cache writes cost $12.50, 1-hour cache writes cost $20, and Batch API input/output receives a 50% discount. |
| Capabilities | textvisionreasoningcodingtool-useagentslong-context | textvisionreasoningcodingtool-useagentslong-contextadaptive-thinking |
| Training Cutoff | — | 2026-06 |
| Max Output | 128K tokens | 128K tokens |
| API Identifier | claude-fable-5 | claude-fable-5-1 |
| Benchmarks | ||
| Artificial Analysis Intelligence Index v4.3 | 49.7 indexartificial-analysis | 53.4 indexartificial-analysis |
| Artificial Analysis Intelligence Index v4.3 | 50 indexhttps://artificialanalysis.ai/models/claude-fable-5 | — |
| GPQA Diamond | 92.6%artificial-analysis | 93.7%artificial-analysis |
| SciCode | 61%artificial-analysis | 63.1%artificial-analysis |
| Terminal-Bench 2.1 | 84.6%artificial-analysis | 91.4%artificial-analysis |
| View Claude Fable 5 | View Claude Fable 5.1 | |
Cost Calculator
Enter your expected monthly token usage to compare costs.
| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Claude Fable 5Cheapest | $10.00 | $25.00 | $35.00 | — |
| Claude Fable 5.1Cheapest | $10.00 | $25.00 | $35.00 | — |
Anthropic
Claude Fable 5
Claude Fable 5 is Anthropic's most capable widely released model for ambitious, long-horizon agentic work. Official Claude docs list the claude-fable-5 API ID, 1M token context window, 128k max output, always-on adaptive thinking, and $10 input / $50 output pricing per million tokens.
Anthropic
Claude Fable 5.1
Claude Fable 5.1 is Anthropic's model for demanding reasoning and long-horizon agentic work. It supports text and image input, text output, a 1M-token context window and always-on adaptive thinking. Anthropic recommends Claude Opus 5 for most workloads and Fable 5.1 when higher-effort Opus evaluations fall short.
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