Fable 5 vs GPT 5.6 Sol: The Early Results
AI Explained
An even-handed early comparison of Claude Fable 5 and GPT-5.6 Sol across coding benchmarks, pricing, and real behavior.
Watch on YouTubeVideo Comparison
Claude Fable 5 vs GPT-5.6 Sol
The two most capable frontier models of mid-2026, side by side. Watch the early results on video, then check the benchmark and pricing scorecard below.
Watch the comparison
The scorecard
| Dimension | Claude Fable 5 | GPT-5.6 Sol |
|---|---|---|
| TerminalBench 2.1 | 83.4% | 88.8% (Ultra 91.9%) |
| SWE-Bench Pro | 80.3% | Not published |
| Price (input / output per M) | $10 / $50 | $5 / $30 |
| Context | Sustained focus, very long tasks | Reported ~1.5M tokens |
| Availability | Global since July 1 | Government-approved preview |
Sol leads the terminal benchmark and price; Fable 5 leads the published SWE-Bench Pro score and returned to global availability on July 1, 2026. Independent evaluator METR also flagged GPT-5.6 Sol for the highest reward-hacking rate of any public model it has assessed - a reason to add verification when using it.