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The budget-thinking branch sized `max_tokens` with a flat REASONING_MAX_TOKENS_CEILING of 32000, so a caller asking for 128000 on Opus 4.6 or Sonnet 4.6 silently got 32000 — a quarter of what those models document. The adaptive branch directly above already honours an explicit caller limit above 32k; this one overrode it. The constant dates from Claude 4.x models that really stopped near 32k. Opus 4.6 and Sonnet 4.6 document 128K synchronous output and Haiku 4.5 documents 64K, so the flat value is no longer a safe ceiling for the families that take this path: `usesAdaptiveThinking` sends sonnet >= 5, opus >= 4.7 and fable down the adaptive branch, leaving exactly opus-4-6, sonnet-4-6 and haiku-4-5 here, and all three exceed 32000. It now clamps to `configuredMaxOut`, the per-model value already resolved a few lines above for the omitted-limit default (`modelMaxOutputTokens` falling back to `defaultMaxOutputTokens`), so this reuses that lookup rather than adding a second one. REASONING_MAX_TOKENS_CEILING stays the fallback for a target whose ceiling is unknown, which keeps today's behaviour for an unconfigured provider. Measured before and after, with the provider carrying the seeded maxima: opus-4-6 asked 128000 -> 32000 before, 128000 after sonnet-4-6 asked 128000 -> 32000 before, 128000 after haiku-4-5 asked 128000 -> 32000 before, 64000 after (its real maximum) opus-4-6 asked 10000 -> 24576 both (budget+headroom, unchanged) no maxima asked 128000 -> 32000 both (fallback preserved) Anthropic's invariant `max_tokens > thinking.budget_tokens` holds in every case above; the test asserts it alongside the figures. Follow-up to lidge-jun#6329, where the per-model maxima landed and the reviewer noted this clamp as still outstanding. Verification: `bun run typecheck` clean; 73/73 in tests/adapters/anthropic/anthropic-reasoning.test.ts. The new case fails with "Expected: 128000, Received: 32000" without the source change. tests/adapters/anthropic reports the same 654 pass / 30 fail with and without it — those are pre-existing account-pause/pacing failures on dev, unrelated to max_tokens. Co-Authored-By: Claude Code <noreply@anthropic.com>
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughNon-adaptive Anthropic reasoning requests now use a valid configured model output ceiling when available, with a 32,000-token fallback. Regression tests cover model-specific ceilings, requested output limits, and reasoning headroom. ChangesAnthropic reasoning output limits
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to The change preserves existing reasoning capacity for low defaults and supports larger configured model limits. No actionable merge-blocking risk remains on the supplied evidence, subject to normal CI checks. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to Larger responses can be sent without reserving their output against configured spending limits. This increases potential overruns, particularly for concurrent requests or responses that end without usage data. Retained concerns
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Review comments at @src/adapters/anthropic.ts:
- Around line 1060-1062: Update the `modelCeiling` calculation so fallback
values such as `defaultMaxOutputTokens` or fallback `modelMaxOutputTokens` do
not act as capability ceilings; use canonical Anthropic model metadata or a
distinct capability field for documented maxima. Keep fallback budgets for
omitted requests, preserve explicit `maxOutputTokens` values, and add regression
coverage confirming a larger explicit request with a low fallback budget retains
a 16,384-token thinking budget unless the capability ceiling requires reduction.
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src/adapters/anthropic.tstests/adapters/anthropic/anthropic-reasoning.test.ts
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…hinking clamp Addresses CodeRabbit's finding on lidge-jun#6355: the first revision treated `configuredMaxOut` as a capability ceiling, but that value is two different things depending on the provider. On the canonical Anthropic entries it is a documented Messages API maximum. On any other provider it is a plain fallback budget for requests that omit `max_output_tokens`. Reading the second as the first meant an operator's deliberately cheap `defaultMaxOutputTokens: 8192` was interpreted as "this model cannot emit more", so an explicit 128000 request was clamped to 8192 with the thinking budget squeezed to 4096 — below the 32000/16384 this path produced before the change. Reproduced before fixing: defaultMaxOutputTokens 8192, explicit 128000, high effort before this commit: max_tokens 8192, budget_tokens 4096 base (pre-PR): max_tokens 32000, budget_tokens 16384 The clamp now takes the LARGER of the configured value and REASONING_MAX_TOKENS_CEILING, so the historical ceiling acts as a floor: a stated maximum can lift it where the vendor documents more, and a low fallback budget can never drag it below what the flat constant already allowed. seeded maxima opus-4-6 explicit 128000 -> 128000 (its documented maximum) seeded maxima haiku-4-5 explicit 128000 -> 64000 (its documented maximum) cheap 8192 opus-4-6 explicit 128000 -> 32000 (floor held, budget 16384) no maxima opus-4-6 explicit 128000 -> 32000 (unchanged) The fallback budget still decides an omitted request, which is what it is for, and that is asserted too so the two roles stay distinguished. Verification: `bun run typecheck` clean; 74/74 in anthropic-reasoning.test.ts, the new case covering the low-budget regression with the explicit assertion that budget_tokens stays 16384. tests/adapters/anthropic unchanged at the same pre-existing 30 failures. Co-Authored-By: Claude Code <noreply@anthropic.com>
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Thanks — that finding is correct, and I reproduced it before changing anything. With The root of it is the one you named: Rather than generalise that exception, the clamp now takes the larger of the configured value and
Added the regression coverage you asked for: the low-fallback-budget case asserts I did not add a separate capability field. Taking the max of the two removes the failure mode without widening the provider config surface, and
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Reviewed exact head 3f94e5c against dev 6429463. My isolated Bun 1.4.0 run of tests/adapters/anthropic/anthropic-reasoning.test.ts passed 74 tests / 194 assertions under CPUQuota=75%, MemoryMax=1536M and fresh application homes. The low-fallback regression is now covered and the previous budget reduction is removed; no new P0-P2 found in this two-file diff. I authorized the exact-head hosted CI runs to obtain the missing required evidence; this is not merge approval. The broader 30 failures in the description remain author-reported baseline comparisons, not a suite I reran. No live Anthropic response or actual vendor maximum was independently measured here. Non-blocking precision: this implementation raises the historical ceiling using configured metadata; it does not independently discover a real capability ceiling for arbitrary custom providers. Please keep that distinction explicit in the description and wait for current-head required CI before approval.
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Approved exact head 3f94e5c. The budget-regression finding is resolved, and the prior isolated 74-test / 194-assertion run remains valid on this unchanged tree. Current-head Cross-platform CI 36818462077 and required checks are successful; readiness is complete. Trusted dev has advanced two unrelated role/state-snapshot commits to a6114b6. The approval covers configured output-limit arithmetic and preservation of the low-fallback reasoning budget, not independent live verification of vendor maxima. The description should retain the custom-provider/configured-metadata qualification from my preceding review. No security scan, live account operation or merge was performed.
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Summary
Follow-up to #6329, where the per-model Anthropic output maxima landed. The reviewer noted there that the old thinking path still carries a flat clamp; this is that clamp.
The budget-thinking branch sized
max_tokenswith a flatREASONING_MAX_TOKENS_CEILINGof 32000, so a caller asking for 128000 on Opus 4.6 or Sonnet 4.6 silently received 32000 — a quarter of what those models document. The adaptive branch immediately above already honours an explicit caller limit above 32k (adaptive-thinking model preserves explicit maxOutputTokens above the default ceiling); this branch overrode it.The constant dates from Claude 4.x models that really did stop near 32k. It is no longer a safe ceiling for the families that still take this path:
usesAdaptiveThinkingroutes sonnet >= 5, opus >= 4.7 and fable to the adaptive branch, leaving exactlyclaude-opus-4-6,claude-sonnet-4-6andclaude-haiku-4-5here — 128K, 128K and 64K respectively, all above 32000.It now clamps to
configuredMaxOut, the per-model value already resolved ~70 lines above for the omitted-limit default (modelMaxOutputTokensfalling back todefaultMaxOutputTokens), so this reuses that lookup instead of adding a second one.REASONING_MAX_TOKENS_CEILINGstays the fallback when the provider states no ceiling, which preserves today's behaviour for an unconfigured provider.Measured through
buildRequest, provider carrying the seeded maxima:claude-opus-4-6claude-sonnet-4-6claude-haiku-4-5claude-opus-4-6claude-opus-4-6, no configured maximaAnthropic's
max_tokens > thinking.budget_tokensinvariant holds in every case; the test asserts it alongside the figures rather than trusting the arithmetic.Verification
bun run typecheck— clean.bun test tests/adapters/anthropic/anthropic-reasoning.test.ts— 73/73.Expected: 128000, Received: 32000without the source change.bun test tests/adapters/anthropic— 654 pass / 30 fail before and after, identical set. Those 30 are pre-existing account-pause/pacing failures ondevand unrelated tomax_tokens.devat64294638a; the fix(anthropic): give each Claude model its real 128K output maximum #6329 commit dropped as already upstream.anthropic-reasoning.test.ts, and neither that file norsrc/adapters/anthropic.tsis tracked intests/fixtures/file-size-baseline.json.Full-suite validation was not run locally; the focused adapter set above plus typecheck is what I exercised, with remaining coverage left to CI.
I could not exercise Opus 4.6 or Sonnet 4.6 live, so the 128K figures are from Anthropic's model pages rather than an observed upstream response. The behavioural claims above are all measured at the adapter boundary.
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