fix(opencode): compaction uses selected session model, not hardcoded sonnet#25
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…dcoded sonnet selectCompactionModel forced every non-anthropic session model through claude-sonnet-4-6 for summarization. That is wasteful and counterproductive for large-context drivers (e.g. a 1M-token model gets routed through sonnet). Tier 4 now returns the session model. The opt-in tiers (agent.model, compaction.model, compaction.model_overrides) are unchanged, so anyone who wants a dedicated compaction model — including sonnet — still gets it. Closes anomalyco#377
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What
Closes hivemind anomalyco#377.
selectCompactionModel()inpackages/opencode/src/session/compaction.tshad a tier-4 default that forced every non-Anthropic session model to compact viaclaude-sonnet-4-6. For a large-context driver (the motivating case: a deepseek 1M-context model) this is wasteful and counterproductive — you pay for a sonnet round-trip to summarize history the driver could compact itself.Change
Tier 4 now returns the session model. One-file change.
The opt-in tiers are untouched, so configurability is fully preserved:
agent.model(explicit compaction-agent override)compaction.model(provider/model, e.g.anthropic/claude-sonnet-4-6)compaction.model_overrides(glob-pattern, keyed on the session model)Anyone who wants sonnet-for-compaction (or Haiku, etc.) still gets it via tiers 1-3 — including a
model_overridesglob to scope it to specific drivers.Acceptance (anomalyco#377)
opencode.json/ active provider config by defaultVerification
bun typecheck— cleanbun test test/session/compaction.test.ts test/session/compaction-strip.test.ts— 59 pass / 0 failNotes
compaction.modelconfig knob + structured summary prompt) already landed ondev.