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fix: correct ultrathink token budget from 64000 to 63999

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The Claude API requires max_tokens >= budget + 1, so setting the budget
to 63999 allows max_tokens to be set to 64000 (the API limit).

This fixes potential API rejections when using ultrathink mode.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Test User
2026-01-18 19:35:40 +01:00
parent 0b2cf9b06c
commit efdb8c711a
3 changed files with 5 additions and 5 deletions
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apps/backend/phase_config.py
+1 -1
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@@ -25,7 +25,7 @@ THINKING_BUDGET_MAP: dict[str, int | None] = {
"low": 1024, "low": 1024,
"medium": 4096, # Moderate analysis "medium": 4096, # Moderate analysis
"high": 16384, # Deep thinking for QA review "high": 16384, # Deep thinking for QA review
"ultrathink": 64000, # Maximum reasoning depth (within Claude API's 64000 token limit) "ultrathink": 63999, # Maximum reasoning depth (API requires max_tokens >= budget + 1, so 63999 + 1 = 64000 limit)
} }
# Spec runner phase-specific thinking levels # Spec runner phase-specific thinking levels
apps/frontend/src/shared/constants/models.ts
+1 -1
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@@ -28,7 +28,7 @@ export const THINKING_BUDGET_MAP: Record<string, number | null> = {
low: 1024, low: 1024,
medium: 4096, medium: 4096,
high: 16384, high: 16384,
ultrathink: 64000 // Maximum reasoning depth (Claude API hard limit) ultrathink: 63999 // Maximum reasoning depth (API requires max_tokens >= budget + 1, so 63999 + 1 = 64000 limit)
} as const; } as const;
// ============================================ // ============================================
tests/test_thinking_level_validation.py
+3 -3
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@@ -32,8 +32,8 @@ class TestThinkingLevelValidation:
assert get_thinking_budget("none") is None assert get_thinking_budget("none") is None
def test_ultrathink_max_budget(self): def test_ultrathink_max_budget(self):
"""Test that 'ultrathink' returns maximum budget (Claude API's 64000 token limit).""" """Test that 'ultrathink' returns maximum budget (63999 so max_tokens = 63999 + 1 = 64000 limit)."""
assert get_thinking_budget("ultrathink") == 64000 assert get_thinking_budget("ultrathink") == 63999
def test_invalid_level_logs_warning(self, caplog): def test_invalid_level_logs_warning(self, caplog):
"""Test that invalid thinking level logs a warning.""" """Test that invalid thinking level logs a warning."""
@@ -89,4 +89,4 @@ class TestThinkingLevelValidation:
assert get_thinking_budget("low") == 1024 assert get_thinking_budget("low") == 1024
assert get_thinking_budget("medium") == 4096 assert get_thinking_budget("medium") == 4096
assert get_thinking_budget("high") == 16384 assert get_thinking_budget("high") == 16384
assert get_thinking_budget("ultrathink") == 64000 assert get_thinking_budget("ultrathink") == 63999