orchestrate: GPT-6 Sol replaces Astra as the bundled Codex executor

[Tryanks]

The execution layer's bundled Codex profile is now gpt-6-sol; Astra
stays a bundled collaboration peer and can still be added as an executor
by hand. Sol's guidance chooses effort per task (low for small clear
briefs, medium for routine work, higher as constraints grow) instead of
Astra's low-only rule, and the workflow prompt and settings copy follow.

Migration: an untouched bundled Codex executor row, whether the old
Sol 5.6 default or either Astra default text, becomes the Sol 6 built-in
unless the user already added Sol 6; rows with custom text, an endpoint
profile, or changed switches stay as they are.

Sol's profile now follows OpenAI's model guidance rather than Astra's
low-only rule: built for complex coding and agentic workflows, about half
the factual errors of GPT-5.6 Sol, Astra-level reliability at a fraction
of the cost, Opus-class computer use at far lower cost per task, and
medium as the recommended starting effort. It is named the primary
executor so ordinary work goes there first.

Opus 5.5's profile is reworded as the secondary executor: a Claude Code
perspective, a cross-provider second implementation or review, or a
fallback when Sol is unavailable or stalls. The previous Opus text is
kept as a constant so untouched rows migrate to the new wording and
customised ones are left alone. The workflow prompt and settings copy
say the same.

Sources

• Codex model guidance: Sol "built for complex coding and agentic workflows, with stronger factual reliability and clearer communication than GPT-5.6 Sol"; start with Medium effort; raise it for tasks needing more planning, analysis or checking. https://learn.chatgpt.com/docs/models
• OpenAI announcement / press: about half as many mistakes as GPT-5.6 Sol, Astra-level reliability at much lower cost; API $2 / $10 per MTok; OSWorld 2.0 Sol xhigh 60.5% vs Opus 5 medium 60.3% at ~80% lower cost per task. https://openai.com/index/introducing-gpt-6-sol-and-luna/ https://techcrunch.com/2026/09/22/openai-launches-gpt-6-sol-and-luna/ https://9to5mac.com/2026/09/22/openai-upgrading-chatgpt-and-codex-with-two-more-gpt-6-models/
• Local Codex models cache: gpt-6-sol, default reasoning medium, efforts low–ultra, fast tier.

Checks

• cargo fmt --all --check, cargo clippy --workspace --all-targets --locked -- -D warnings, cargo nextest run --workspace --locked (929 passed, 5 skipped)