Claude Fable 5vsClaude Mythos Preview
Across 4 shared benchmarks, Claude Fable 5 leads overall: Claude Fable 5 wins 3, Claude Mythos Preview wins 1, with 0 ties and an average score difference of +0.83.
Claude Fable 5
Anthropic · 2026-06-09 · Reasoning model
Claude Mythos Preview
Anthropic · 2026-04-07 · Chat model
Claude Fable 53 wins(75%)(25%)1 winClaude Mythos Preview
Benchmark scores
Grouped by capability, sorted by largest gap within each. 4 shared benchmarks.
Coding and Software Engineer
Claude Fable 5 2/2| Benchmark | Claude Fable 5 | Claude Mythos Preview | Diff |
|---|---|---|---|
| SWE-Bench Pro - Public | 80.301 / 57Deep Thinking (With Tools) | 77.803 / 57Extended (with tools) | +2.50 |
| SWE-bench Verified | 952 / 114Deep Thinking (With Tools) | 93.904 / 114Extended (with tools) | +1.10 |
AI Agent - Tool Usage
Claude Fable 5 1/1| Benchmark | Claude Fable 5 | Claude Mythos Preview | Diff |
|---|---|---|---|
| OSWorld-Verified | 851 / 26Thinking High (With Tools) | 79.608 / 26Extended (with tools) | +5.40 |
General Knowledge
Claude Mythos Preview 1/1| Benchmark | Claude Fable 5 | Claude Mythos Preview | Diff |
|---|---|---|---|
| HLE | 595 / 181Deep Thinking (No Tools) | 64.701 / 181Extended (with tools) | -5.70 |
Specs
| Field | Claude Fable 5 | Claude Mythos Preview |
|---|---|---|
| Publisher | Anthropic | Anthropic |
| Release date | 2026-06-09 | 2026-04-07 |
| Model type | Reasoning model | Chat model |
| Architecture | Dense | Dense |
| Parameters | Not available | Not available |
| Context length | 1M | Not available |
| Max output | 128K | 8K |
API pricing
Prices use DataLearner records when available; missing fields are not inferred.
| Item | Claude Fable 5 | Claude Mythos Preview |
|---|---|---|
| Text input | $10 / 1M tokens | $25 / 1M tokens |
| Text output | $50 / 1M tokens | $125 / 1M tokens |
| Cache read | $1 / 1M tokens | Not public |
| Cache write | $12.5 / 1M tokens | Not public |
Summary
- Claude Fable 5leads in:Coding and Software Engineer (2/2), AI Agent - Tool Usage (1/1)
- Claude Mythos Previewleads in:General Knowledge (1/1)
On average across the 4 shared benchmarks, Claude Fable 5 scores 0.83 higher.
Largest single-benchmark gap: HLE — Claude Fable 5 59 vs Claude Mythos Preview 64.70 (-5.70).
Page generated from structured model, pricing and benchmark records. No real-time LLM is used to write the prose.