Claude Fable 5 vs GPT-5.6 Sol
Side-by-side comparison. Updated 2026-08-23.
Compare Claude Fable 5 and GPT-5.6 Sol across pricing, context window, modalities, strengths, weaknesses, and best-fit workloads.
Use the details below to weigh cost, context, modalities, and workload fit.
At a Glance
| Attribute | Claude Fable 5 | GPT-5.6 Sol |
|---|---|---|
| Lab | Anthropic | OpenAI |
| Tags | Agentic Coding Intelligent Reasoning Long Context | Agentic Coding Intelligent Long Context Reasoning |
| Context | 1,000,000 tokens | 1,050,000 tokens |
| Input price | $10.00/1M | $5.00/1M |
| Output price | $50.00/1M | $30.00/1M |
| Input modalities | Image, Text | Text |
| Output modalities | Text | Text |
Claude Fable 5 Strengths
- #1 Intelligence Index at 64.9
- 1M-token context window
- 95% on SWE-bench Verified
- Strong agentic and coding performance
- Vision and scientific research capable
GPT-5.6 Sol Strengths
- Terminal-Bench 2.1 SOTA (91.9% in Ultra mode)
- Ultra multi-agent mode coordinates parallel sub-agents for complex tasks
- 1.05M-token context for long-horizon agentic work
- Max reasoning-effort control for deeper single-pass reasoning
- New predictable prompt-caching with explicit cache controls
Claude Fable 5 vs GPT-5.6 Sol
GPT-5.6 Sol and Claude Fable 5 are both aimed at long-horizon, agentic work, but they emphasize different trade-offs. Sol is the cheaper option on the current list prices and offers a slightly larger 1.05M-token context window, plus explicit max-reasoning and multi-agent controls. Fable 5 costs more, but its current profile leads on the Intelligence Index and SWE-bench Verified, with strong autonomous software-engineering and research positioning. Choose Sol when controllable reasoning, coordinated sub-agents, and lower token cost matter most; choose Fable 5 when frontier coding and complex knowledge-work performance justify the premium.