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fix: add claude-opus-5 to KNOWN_MODEL_WINDOW_TOKENS (#2609)

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* fix: add claude-opus-5 to KNOWN_MODEL_WINDOW_TOKENS

claude-opus-5 has a 1M context window (verified: 250k tokens at 25%
usage = ~1M), but was missing from the model table. This caused
resolveContextWindowTokens() to fall back to the 200k default when
tokens < 200k, incorrectly triggering compact warnings in the first
20% of a 1M session.

Same failure class as #2290 (Opus 4.x) and #2461 (fable-5/mythos-5).
The env override (ECC_CONTEXT_WINDOW_TOKENS) remains the escape hatch
for unlisted models.

Refs: #2290, #2461, #2468

* test: add regression test for claude-opus-5 context window

Verifies resolveContextWindowTokens returns LARGE_CONTEXT_WINDOW_TOKENS
for claude-opus-5 at 50k tokens, matching the behavior of fable-5 and
mythos-5 in the known-model table.
This commit is contained in:
Bob.Hou
2026-08-04 00:27:33 -04:00
committed by GitHub
parent 26f633462b
commit ab373716e7
2 changed files with 5 additions and 0 deletions
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scripts/lib/transcript-context.js
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@@ -35,6 +35,7 @@ const LARGE_WINDOW_MODEL_MARKER = '[1m]';
// Checked in order, first match wins. Best-effort and expected to lag new
// releases; the env override remains the escape hatch for unlisted models.
const KNOWN_MODEL_WINDOW_TOKENS = [
['claude-opus-5', LARGE_CONTEXT_WINDOW_TOKENS],
['claude-fable-5', LARGE_CONTEXT_WINDOW_TOKENS],
['claude-mythos-5', LARGE_CONTEXT_WINDOW_TOKENS]
];