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fix(anthropic): send fast mode speed via extra_body

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This commit is contained in:
Kenny Xie
2026-04-13 13:37:05 -07:00
committed by Teknium
parent 110892ff69
commit cdd44817f2
2 changed files with 26 additions and 8 deletions
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15
agent/anthropic_adapter.py
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@@ -1230,9 +1230,10 @@ def build_anthropic_kwargs(
When *base_url* points to a third-party Anthropic-compatible endpoint,
thinking block signatures are stripped (they are Anthropic-proprietary).
When *fast_mode* is True, adds ``speed: "fast"`` and the fast-mode beta
header for ~2.5x faster output throughput on Opus 4.6. Currently only
supported on native Anthropic endpoints (not third-party compatible ones).
When *fast_mode* is True, adds ``extra_body["speed"] = "fast"`` and the
fast-mode beta header for ~2.5x faster output throughput on Opus 4.6.
Currently only supported on native Anthropic endpoints (not third-party
compatible ones).
"""
system, anthropic_messages = convert_messages_to_anthropic(messages, base_url=base_url)
anthropic_tools = convert_tools_to_anthropic(tools) if tools else []
@@ -1333,11 +1334,11 @@ def build_anthropic_kwargs(
kwargs["max_tokens"] = max(effective_max_tokens, budget + 4096)
# ── Fast mode (Opus 4.6 only) ────────────────────────────────────
# Adds speed:"fast" + the fast-mode beta header for ~2.5x output speed.
# Only for native Anthropic endpoints — third-party providers would
# reject the unknown beta header and speed parameter.
# Adds extra_body.speed="fast" + the fast-mode beta header for ~2.5x
# output speed. Only for native Anthropic endpoints — third-party
# providers would reject the unknown beta header and speed parameter.
if fast_mode and not _is_third_party_anthropic_endpoint(base_url):
kwargs["speed"] = "fast"
kwargs.setdefault("extra_body", {})["speed"] = "fast"
# Build extra_headers with ALL applicable betas (the per-request
# extra_headers override the client-level anthropic-beta header).
betas = list(_common_betas_for_base_url(base_url))