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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.59 ·

Opus 4.6 Model Routing [Gradual Rollout]

Entry
JSON All of v2.1.59
EntryKind: in v2.1.59,
Bug FixesSection of the release
What

Infrastructure for routing requests to the Opus 4.6 model when a coral_reef_opus feature flag is enabled server-side.

Status

Feature-flagged via coral_reef_opus

Details
  • When coral_reef_opus is "true" and the model string contains "opus-4-6", a special token limit of 1,000,000 is applied
  • Extended output is enabled for matching Opus 4.6 models via the HbA() function
  • Gated behind multiple checks: not in test mode, not using custom provider
Evidence

Model routing (search for "coral_reef_opus", "opus-4-6")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.59 →

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