AITechStartupsabout 3 hours ago
GPT-5.6 vs Claude Fable 5: AI Showdown
1 min read
OpenAI released GPT-5.6 on July 9 as a three-model family (Sol, Terra, Luna) after a security review delay. Anthropic launched Claude Fable 5 on June 10, based on its Mythos-class AI. Sol matched Mythos Preview on ExploitBench using one-third the output tokens. Fable 5 is generally available; GPT-5.6 remains in limited preview.
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In this storyAnthropic
