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OpenAI's GPT-5.6 (Sol, Terra, Luna) is a serious release — and that's good for everyone: better per-task quality, flexible token budgets, and a stronger Codex + Claude Code duo.
A hands-on take on Claude Fable 5: at the same effort level it's faster than Opus 4.8 with noticeably better code quality — but roughly a third of security audits get blocked by its widened cyber classifier and rerouted to Opus 4.8.
Anthropic's new Mythos-class model, Claude Fable 5, is its strongest coding and agentic model yet — cheaper than the preview, with a new safeguard layer that can fall back to Opus 4.8.