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Claude Fable 5.1 (claude-fable-5-1) is available for claude agents, with the same xhigh/max effort gate as Fable 5. Cost tracking uses its cache-read rate (0.025x base input, $0.25/1M) instead of the 0.1x every other Anthropic model uses.
GPT-6 Astra (gpt-6-astra, codex CLI 0.153.3) is available for codex agents and is now the codex default. Its default effort is low; ultra is offered for ad-hoc sessions only. gpt-reserve also appeared in the CLI but is hidden upstream, so it is intentionally not listed.
Changed
Claude sessions are reset once the prompt cache has gone cold. After the session JSONL has idled for 60 minutes (past Claude Code's longest automatic cache TTL) the reset threshold drops from 150k to 30k tokens, so --resume stops rewriting a large transcript at cache-write price with no cache benefit. The interactive idle guard and the pre-reset diary summary are unchanged.
Fixed
Creating a codex, grok or custom-* agent through the API without a model no longer hands the backend CLI sonnet. The fallback is claude-only; other tools keep the empty value and let the CLI pick its own default.
The pre-reset diary summary now receives the exact path of the session file being deleted. It used to pick the most recently modified JSONL, which could be a different keyed session.