fix(bedrock-invoke): use native output_format for Claude 4.5+ models that support it - #29898
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Greptile SummaryThis PR fixes two real Bedrock invoke regressions: for Claude 4.5+ models that AWS now accepts native
Confidence Score: 4/5Safe to merge for the targeted bug fix; the behavioral change to the native output_format path for existing opus-4-6/sonnet-4-5/sonnet-4-6 Bedrock invoke callers deserves a smoke-test against a live AWS endpoint before merging. The core logic is sound — the registry-flag approach correctly routes native vs tool-injection paths, the response transformer handles both shapes, and the adaptive-thinking fix is verified by the new regression test. The area worth a closer look is that models like opus-4-6, sonnet-4-5, and sonnet-4-6 now silently switch from tool-injection to native output_format on Bedrock invoke for all existing callers; this is the intended improvement but is a behavioral change not previously exercised on those models in the invoke path. anthropic_claude3_transformation.py (double _supports_factory lookup and is_thinking_enabled check on non_default_params) and the existing test_output_format_removed_from_bedrock_invoke_request test (relies on an unknown model staying absent from the registry).
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| Filename | Overview |
|---|---|
| litellm/llms/bedrock/chat/invoke_transformations/anthropic_claude3_transformation.py | Core logic change: removes model-name spoofing, introduces per-model capability flag routing via _supports_factory. Two registry reads per request and a subtle is_thinking_enabled check against non_default_params rather than optional_params. |
| litellm/anthropic_beta_headers_config.json | Correctly enables structured-outputs-2025-11-13 for the bedrock invoke section only; anthropic/bedrock_converse already allowed it. |
| model_prices_and_context_window.json | Flips supports_native_structured_output to false on 11 opus-4-7/opus-4-8 Bedrock entries, affecting both invoke and converse paths. |
| tests/test_litellm/llms/bedrock/chat/invoke_transformations/test_bedrock_chat_invoke_transformations_anthropic_claude3_transformation.py | Four new targeted tests added; existing test relies on unknown model staying absent from registry; assert_called_once_with weakened to assert_any_call. |
| tests/test_litellm/llms/bedrock/chat/test_converse_transformation.py | Model changed to opus-4-6 (opus-4-7 no longer supports native structured output); effort changed from xhigh to high accordingly. |
| litellm/model_prices_and_context_window_backup.json | Mirror of model_prices_and_context_window.json: same 11 entries flipped. |
Reviews (3): Last reviewed commit: "ci: retrigger CI after base branch switc..." | Re-trigger Greptile
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PR overviewAll previously flagged issues have been addressed. No open security concerns remain on this pull request. Security reviewNo open security issues remain on this pull request. Fixed/addressed: 1 · PR risk: 0/10 |
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Updated to drive off the existing supports_native_structured_output flag in the model map instead of a hardcoded substring list — addresses the project-rule violation Greptile (correctly) flagged. The flag flip on opus-4-7/4-8 Bedrock entries fixes both Invoke and Converse simultaneously since the Converse transformer already reads the same flag. |
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I don;t think this is the scope of this PR
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the PR was initially opened against the wrong base branch, which made the diff include unrelated upstream commits. I've re-pointed it at litellm_internal_staging so the diff now shows only the intended changes. Could you take another look?
…support it, gate via registry flag PR BerriAI#19877 forced every response_format request on Bedrock invoke through synthetic tool-injection by spoofing the model name to claude-3-sonnet-20240229. AWS has since shipped native output_format support for most Claude 4.5+ models (opus-4-6, sonnet-4-5/4-6, haiku-4-5). For those, tool-injection wastes ~3.4x input tokens vs. native and is fragile under reasoning_effort. Side-effect of the spoof: when response_format is combined with reasoning_effort, _is_adaptive_thinking_model is called with the spoofed model name, fails, and emits legacy thinking.enabled+budget_tokens — which AWS opus-4-7/4-8 reject with: "thinking.type.enabled is not supported for this model. Use thinking.type.adaptive and output_config.effort to control thinking behavior." Fix: pre-hoc strip-and-inject pattern, gated on the existing supports_native_structured_output flag on the Bedrock entry in model_prices_and_context_window.json (single source of truth — same flag the Converse transformer reads at converse_transformation.py:1014). When the flag is true (opus-4-6, sonnet-4-5/4-6, haiku-4-5): let the parent emit native output_format; auto-add the structured-outputs-2025-11-13 beta header. When the flag is false (opus-4-7, opus-4-8 today): pop response_format from non_default_params BEFORE delegating to AnthropicConfig.map_openai_params so the parent doesn't emit output_format. The parent then sees the real model name — adaptive thinking, effort mapping, and beta-header derivation all work correctly. After the parent returns, manually inject the json_tool_call tool using the parent's own public helpers. Companion changes: - Flip supports_native_structured_output from true to false on opus-4-7 and opus-4-8 Bedrock entries in model_prices_and_context_window.json and litellm/model_prices_and_context_window_backup.json (22 entries total across both files). AWS rejects native output_format on both Invoke and Converse for these two models; this flip fixes both surfaces simultaneously since they read the same flag. - Flip bedrock.structured-outputs-2025-11-13 from null to "structured-outputs-2025-11-13" in anthropic_beta_headers_config.json so filter_and_transform_beta_headers no longer drops the gating header. When AWS ships native output_format support on opus-4-7/4-8 Bedrock, flip the registry flag back to true (one-line revert per entry). Tests: - test_response_format_emits_native_output_format_for_opus_4_6_invoke - test_response_format_uses_tool_workaround_for_opus_4_7_invoke - test_response_format_plus_reasoning_preserves_adaptive_thinking_on_opus_4_7 - test_response_format_plus_reasoning_uses_native_with_adaptive_on_opus_4_6 - Updated test_bedrock_chat_invoke_checks_output_config_support_with_bedrock_provider to assert_any_call (two _supports_factory calls now happen) Refs: AWS doc confirming opus-4-7 requires adaptive thinking — https://docs.aws.amazon.com/bedrock/latest/userguide/model-card-anthropic-claude-opus-4-7.html
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@greptileai check for any regressions that can happen |
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@arunmittal21 @Sameerlite hey guys, and update on this pr? we're facing these issues and it seems like this will fix it for us. |
4 participants
Relevant issues
Fixes two related Bedrock-ction:
response_formatrequetic tool-injection onBedrock invoke even for models AWS now accepts nativeoutput_formatfor(opus-4-6, sonnet-4-5/4-6,put-token bloat (verifiedempirically: ~707 vs ~210 input tokens for the same prompt).
When
response_formatis combined withreasoning_effort, the model-namespoof from PR fix: filter unsupported beta headers for AWS Bedrock Invoke API #19877 corrudel
and emits legacythinking.enabled+budget_tokens`. AWS opus-4-7 and opus-4-8 reject this with:AWS doc confirming opus-4-7 only accepts adaptive thinking: https://docs.aws.amazon.com/bedrock/latest/usergude-opus-4-7.html
Linear ticket
(external contributor)
Pre-Submission checklis
make test-unit(targeted file: 17/17 pass)@greptileaiand receiveda Confidence Score of at lmaintainer review
Delays in PR merge?
If you're seeing a delay ithe LiteLLM Team on [Slack(#pr-review)](https://join.slack.com/t/litellmossslack/shared_invite/zt-3o7nkuyfr-
p_kbNJj8taRfXGgQI1~YyA).
CI (LiteLLM team)
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**Merge / cherry-pic
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Screenshots / Proof of Fix
Empirically verified against AWS Bedrock invoke, same payload before/after:
opus-4-6 invoke,
response_formatonly - Before: wire body hastchoice.input_tokens =707. - After: wire body hasouanthropic_beta=["structured-outputs-2025-11-13"].input_tokens = 210(3.4× reduction). AWS returns pleunwrap neededdownstream. **opus-4-7 invoke,response_format + reasoning_effort: "medium"** - Before: wire body hasting={type:"enabled",budget_tokens:1024}(legacy). AWS returns 400:"thinking.type.enabled" is not supported for this model.`tools=[json_tool_call](notool_choice— AWS rejects forcing alongside thinking"} +output_config={effort:"medium"}. AWS returns 200. Targeted test file:17 passed in 0.31s`.Type
🐛 Bug Fix
Changes
litellm/llms/bedrock/chat/invoke_transformations/anthropic_claude3_transformation.py— replace the uncrom #19877 with aregistry-flag-driven, pre-hoc strip-and-inject pattern:_bedrock_invoke_supports_native_output_format(model)helper readssupports_native_structure_supports_factory(custom_llm_provider="bedrock", ...)— same flag and same lookup mechanism Converse n.py:1014). Single sourceof truth in the model registry; no hardcoded model lists in code. -map_openai_params: wheodel, popresponse_formatfromnon_default_paramsBEFORE delegating toAnthropicConfig.map_openaes the real model name andprocessesreasoning_effort/ adaptive-thinking correctly. After the parent returns, manually inject t tool usingmap_response_format_to_anthropic_tool+_add_tools_to_optional_params— the same public helpers the pa the flag istrue, theparent emits nativeoutput_format` and we let it flow._build_bedrock_anthropistingoutput_formatpopon the same flag check, so models withsupports_native_structured_output: trkeepoutput_formaton th_compute_bedrock_invoke_beta_headers: auto-addstructured-outputs-2025-1 tobeta_setwhenevero_params. AWS requires this gating header alongside the field. **litellm/anthropic_beta_headers_config.json** — flipbedrock.structured-output"structured-outputs-2025-11-13"so the centralizedfilter_and_transform_beta no longer strips it. **model_prices_and_contexlitellm/model_prices_and_context_window_backup.json** — flipsupports_native_structureseon opus-4-7 andopus-4-8 Bedrock entries (11 entries × 2 files = 22 minimal line changes, no JSON reformatting). AWS B_formatfor both models on Invoke AND Converse today (verified empirically); flipping the flag fixes bosurfaces simultaneously sie same flag. **tests/test_litellm/llmsmations/test_bedrock_chat_invoke_transformations_anthropic_claude3_transformation.py** — 4 new mocked t+ 1 existing test updated: -test_response_format_emopus_4_6_invoke— flagtrue→ native happy path:output_format+ beta header, no tools. -test_response_format_us_7_invoke— flagfalse→ workaround:tools + tool_choice, nooutput_format, no beta. -test_response_format_plve_thinking_on_opus_4_7—regression test for the model-spoof side-effect; assertsthinking.type == "adaptive"andoutput_coeasoning is combined withresponse_format. -test_response_format_pl_adaptive_on_opus_4_6—flagtrue+ reasoning:output_format,thinking.adaptive, andoutput_config.effortalltest_bedrock_chat_invoke_checks_output_config_support_with_bedrock_provideupdated fromassert_calleallsince_supports_factoryis now invoked for two keys (supports_native_structurut_config). Tests patchsupports_facace, matching thecodebase's established pattern (`messages/invoke_transformations/test*.py:61Out of scope (deliberately separate PRs)
opus-4-8to_is_adaptive_thinking_modelsubstring fallback (or isupports_adaptive_thinkin). Different bug class —affects opus-4-8 callers usingreasoning_effortalone, regardless ofresponse_format`.temperature/top_p/top_kfromoptional_paramswhen thinking is enabled. Generic Anthropicngs inAnthropicConfig.map_openai_params.