GPT-5.6 Beats Claude Fable 5 with Faster Output and Lower Costs

OpenAI's new GPT-5.6 models, Sol, Terra, and Luna, beat Claude Fable 5 at one-third the cost. See our full API testing and coding benchmark results today.
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GPT-5.6 Release Nears: Ultra Mode Spawns Subagents, Terra Cuts Cost, METR Flags Risk

This photograph taken in Mulhouse, eastern France on October 19, 2023, shows figurines next to the ChatGPT logo. SEBASTIEN BOZON/Getty Images OpenAI's GPT-5.6 family — Sol, Terra, and Luna — has been ...
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GPT-5.6 Sol Review: Faster Coding, Half Fable 5 Cost, and a Benchmark Problem

OpenAI's GPT-5.6 Sol advanced another step toward general availability on July 6 when an OpenAI Codex engineer publicly confirmed that Sol Ultra — the model's highest-compute tier — would ship inside ...