Claude Fable 5vsClaude Opus 4.8
Across 12 shared benchmarks, Claude Fable 5 leads overall: Claude Fable 5 wins 11, Claude Opus 4.8 wins 1, with 0 ties and an average score difference of +9.51.
Claude Fable 5
Anthropic · 2026-06-09 · Reasoning model
Claude Opus 4.8
Anthropic · 2026-05-28 · Reasoning model
Claude Fable 511 wins(92%)(8%)1 winClaude Opus 4.8
Benchmark scores
Grouped by capability, sorted by largest gap within each. 12 shared benchmarks.
Coding and Software Engineer
Claude Fable 5 4/4| Benchmark | Claude Fable 5 | Claude Opus 4.8 | Diff |
|---|---|---|---|
| WeirdML v2 | 87.853 / 52Thinking High (With Tools) | 70.4518 / 52Normal (With Tools) | +17.40 |
| SWE-Bench Pro - Public | 80.301 / 57Deep Thinking (With Tools) | 69.204 / 57Extended (with tools) | +11.10 |
| DeepSWE | 702 / 27Deep Thinking (With Tools) | 5913 / 27Deep Thinking (With Tools) | +11 |
| SWE-bench Verified | 952 / 114Deep Thinking (With Tools) | 88.605 / 114Extended (with tools) | +6.40 |
AI Agent - Tool Usage
Claude Fable 5 3/3| Benchmark | Claude Fable 5 | Claude Opus 4.8 | Diff |
|---|---|---|---|
| Terminal-Bench 2.1 | 884 / 44Deep Thinking (With Tools) | 78.9020 / 44Thinking High (With Tools) | +9.10 |
| OSWorld-Verified | 851 / 26Thinking High (With Tools) | 83.404 / 26Extended (with tools) | +1.60 |
| MCP-Atlas | 83.305 / 38Normal (With Tools) | 82.206 / 38Deep Thinking (With Tools) | +1.10 |
General Knowledge
Even 2/2| Benchmark | Claude Fable 5 | Claude Opus 4.8 | Diff |
|---|---|---|---|
| HLE | 595 / 181Deep Thinking (No Tools) | 57.908 / 181Extended (with tools) | +1.10 |
| LiveBench | 78.315 / 115Deep Thinking (No Tools) | 78.794 / 115Deep Thinking (No Tools) | -0.48 |
Math and Reasoning
Claude Fable 5 2/2| Benchmark | Claude Fable 5 | Claude Opus 4.8 | Diff |
|---|---|---|---|
| FrontierMath Tier 4 v2 | 87.801 / 34最高（无工具） | 56.109 / 34最高（无工具） | +31.71 |
| FrontierMath v2 | 87.023 / 34最高（无工具） | 809 / 34最高（无工具） | +7.02 |
Commonsense Reasoning
Claude Fable 5 1/1| Benchmark | Claude Fable 5 | Claude Opus 4.8 | Diff |
|---|---|---|---|
| SimpleBench | 81.901 / 67Normal (No Tools) | 64.8010 / 67Normal (No Tools) | +17.10 |
Specs
| Field | Claude Fable 5 | Claude Opus 4.8 |
|---|---|---|
| Publisher | Anthropic | Anthropic |
| Release date | 2026-06-09 | 2026-05-28 |
| Model type | Reasoning model | Reasoning model |
| Architecture | Dense | Dense |
| Parameters | Not available | Not available |
| Context length | 1M | 1M |
| Max output | 128K | 125K |
API pricing
Prices use DataLearner records when available; missing fields are not inferred.
| Item | Claude Fable 5 | Claude Opus 4.8 |
|---|---|---|
| Text input | $10 / 1M tokens | $5 / 1M tokens |
| Text output | $50 / 1M tokens | $25 / 1M tokens |
| Cache read | $1 / 1M tokens | $0.5 / 1M tokens |
| Cache write | $12.5 / 1M tokens | $6.25 / 1M tokens |
Summary
- Claude Fable 5leads in:Coding and Software Engineer (4/4), AI Agent - Tool Usage (3/3), Math and Reasoning (2/2), Commonsense Reasoning (1/1)
- Tied in:General Knowledge
On average across the 12 shared benchmarks, Claude Fable 5 scores 9.51 higher.
Largest single-benchmark gap: FrontierMath Tier 4 v2 — Claude Fable 5 87.80 vs Claude Opus 4.8 56.10 (+31.71).
Page generated from structured model, pricing and benchmark records. No real-time LLM is used to write the prose.