Claude Fable 5 vs GPT 5.6 Sol vs Grok 4.5
The frontier tier: the newest reasoning-first flagships from Anthropic, OpenAI, and xAI. Benchmarks tell part of the story; the shared output band shows how differently they write and reason on the same prompt.Last reviewed 2026-07-17.
Claude Fable 5 vs GPT 5.6 Sol vs Grok 4.5
Anthropic's Mythos-class flagship for ambitious, long-running professional work.
OpenAI's GPT-5.6 flagship — built for complex reasoning, agentic coding, and long-running professional work.
xAI's Opus-class flagship for frontier coding, agentic tool use, and knowledge work.
No captured outputs for these models yet.
Frequently asked
Which of Claude Fable 5, GPT 5.6 Sol, and Grok 4.5 is the cheapest?
Grok 4.5 has the lowest blended list price. Per 1M tokens: Claude Fable 5 at $10.00 in / $50.00 out; GPT 5.6 Sol at $5.00 in / $30.00 out; Grok 4.5 at $2.00 in / $6.00 out.
Which of Claude Fable 5, GPT 5.6 Sol, and Grok 4.5 has the largest context window?
GPT 5.6 Sol leads with 1.1M tokens. The other two: Claude Fable 5 at 1M, Grok 4.5 at 500K.
Do Claude Fable 5, GPT 5.6 Sol, and Grok 4.5 support image input?
Yes, all three accept images.
Where can I run Claude Fable 5, GPT 5.6 Sol, and Grok 4.5 side by side?
This idapt comparison runs all three in aligned columns: the same prompt, plus benchmarks, specs, and prices per model. Open any model in chat from its column to keep working with it.