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fix(llm): omit temperature for major-only Opus ids (claude-opus-5) (#5761)

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The version pattern in _anthropic_rejects_temperature() required a minor
component, so major-only ids like `claude-opus-5` never matched and the
guard reported that the model accepts `temperature`. Anthropic rejects the
field outright on Opus 4.7+, so every such call returned HTTP 400 and the
stream aborted with zero tokens ("the model returned an empty response").

Make the minor optional and read a missing minor as `.0`. The major is also
capped at 1-2 digits with a no-trailing-digit lookahead, mirroring the
minor: once the minor is optional, a greedy major would swallow the date in
`claude-3-opus-20240229` and read it as version 20240229, dropping
temperature from a model that accepts it.

Fixes #5753

Co-authored-by: Alexandre Teixeira <111787685+alteixeira20@users.noreply.github.com>
This commit is contained in:
Husam
2026-07-30 13:30:00 +03:00
committed by GitHub
parent 578312200a
commit 84709a00d9
2 changed files with 44 additions and 8 deletions
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tests/test_llm_core_anthropic_temp_omit.py
+25 -1
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@@ -29,6 +29,13 @@ from src.llm_core import _anthropic_rejects_temperature, _build_anthropic_payloa
"anthropic/claude-opus-4-7", # tolerate a provider-prefixed id
"claude-opus-4-10", # future minor still >= 4.7
"claude-opus-5-0", # future major
# Major-only ids: a missing minor reads as `.0`, so these are >= 4.7 too
# (issue #5753). Before the fix the version pattern required a minor, so
# these fell through to "accepts temperature" and every call 400'd.
"claude-opus-5",
"claude-opus-5-20260101", # major-only + dated snapshot
"anthropic/claude-opus-5", # major-only behind a provider prefix
"claude-opus-6", # future major-only
],
)
def test_opus_47_plus_rejects_temperature(model):
@@ -48,7 +55,10 @@ def test_opus_47_plus_rejects_temperature(model):
"claude-opus-4-6-20251201", # dated 4.6 snapshot — older, still keeps temperature
"claude-sonnet-4-6",
"claude-3-5-sonnet",
"claude-3-opus-20240229", # legacy Claude 3 Opus — no opus-N-M pattern, kept
"claude-3-opus-20240229", # legacy Claude 3 Opus — date directly after
# "opus-", so the major must not swallow it as version 20240229 (that is
# what makes capping the major at 1-2 digits necessary once the minor
# became optional in #5753).
"claude-haiku-4-5",
"claude-x",
"octopus-4-8", # "opus" only as a substring of another word — must not match
@@ -87,6 +97,20 @@ def test_payload_keeps_temperature_for_older_models():
assert _payload("claude-3-5-sonnet", 1.2)["temperature"] == 1.0
def test_payload_omits_temperature_for_major_only_opus_5():
# Issue #5753: the scheduled-task path calls stream_agent_loop() without a
# temperature and inherits its 0.3 default, so `claude-opus-5` 400'd on every
# run and surfaced as "the model returned an empty response". Interactive chat
# leaves temperature None and never hit it.
assert "temperature" not in _payload("claude-opus-5", 0.3)
def test_payload_keeps_temperature_for_legacy_claude_3_opus():
# Guards the major-digit cap: `opus-20240229` must not parse as version
# 20240229, or Claude 3 Opus would silently lose the caller's temperature.
assert _payload("claude-3-opus-20240229", 0.5)["temperature"] == 0.5
def test_payload_keeps_temperature_for_dated_opus_4_0():
# Anthropic's dated id for Opus 4.0 (claude-opus-4-20250514) is in this repo's
# ANTHROPIC_MODELS list. The date must not be misread as a >= 4.7 minor, or the