feat(bedrock): add OpenAI-compatible service_tier parameter translation

[Chesars]

Relevant issues

Related to #17911 and #17810

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🆕 New Feature

Changes

Summary

Adds OpenAI-compatible service_tier parameter support for Bedrock Converse API, translating it to Bedrock's native serviceTier format.

Currently, using the OpenAI-style service_tier parameter with Bedrock models throws UnsupportedParamsError:

# This fails with UnsupportedParamsError
litellm.completion(
    model="bedrock/converse/anthropic.claude-3-sonnet-20240229-v1:0",
    messages=[{"role": "user", "content": "Hi"}],
    service_tier="priority"
)

Solution

1. Added service_tier to supported_params in get_supported_openai_params()
2. Added translation in map_openai_params() that converts:
   • service_tier="priority" → serviceTier={"type": "priority"}
   • service_tier="default" → serviceTier={"type": "default"}
   • service_tier="flex" → serviceTier={"type": "flex"}
   • service_tier="auto" → serviceTier={"type": "default"} (Bedrock doesn't support "auto")

Usage

# Now works with OpenAI-style parameter
litellm.completion(
    model="bedrock/converse/anthropic.claude-3-sonnet-20240229-v1:0",
    messages=[{"role": "user", "content": "Hi"}],
    service_tier="priority"  # OpenAI format, automatically translated
)

Tests

Added 5 new tests in tests/test_litellm/llms/bedrock/chat/test_service_tier.py:

• test_service_tier_in_supported_openai_params
• test_map_openai_service_tier_priority
• test_map_openai_service_tier_default
• test_map_openai_service_tier_flex
• test_map_openai_service_tier_auto_maps_to_default

12 tests passing:

======================== 12 passed in 0.04s ========================

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Project	Deployment	Review	Updated (UTC)
litellm	Ready	Preview, Comment	Dec 17, 2025 11:56am