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fix(bedrock): drop toolSpec.strict for Claude Sonnet 5 and Fable 5 #32455

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fix(bedrock): drop toolSpec.strict for Claude Sonnet 5 and Fable 5 #32455

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bbb8af5
fix(bedrock): drop toolSpec.strict for Claude Sonnet 5 and Fable 5
seanturner83 Jul 8, 2026
70ee6ff
test(bedrock): cover all Sonnet 5 / Fable 5 regional variants + fix d…
seanturner83 Jul 8, 2026
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30 changes: 20 additions & 10 deletions litellm/model_prices_and_context_window_backup.json
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1374,7 +1374,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"global.anthropic.claude-fable-5": {
"cache_creation_input_token_cost": 1.25e-05,
Expand Down Expand Up @@ -1408,7 +1409,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"us.anthropic.claude-fable-5": {
"cache_creation_input_token_cost": 1.375e-05,
Expand Down Expand Up @@ -1442,7 +1444,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"eu.anthropic.claude-fable-5": {
"cache_creation_input_token_cost": 1.375e-05,
Expand Down Expand Up @@ -1476,7 +1479,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"anthropic.claude-opus-4-8": {
"bedrock_converse_supports_strict_tools": false,
Expand Down Expand Up @@ -1718,7 +1722,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"global.anthropic.claude-sonnet-5": {
"cache_creation_input_token_cost": 2.5e-06,
Expand Down Expand Up @@ -1752,7 +1757,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"us.anthropic.claude-sonnet-5": {
"cache_creation_input_token_cost": 2.75e-06,
Expand Down Expand Up @@ -1786,7 +1792,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"eu.anthropic.claude-sonnet-5": {
"cache_creation_input_token_cost": 2.75e-06,
Expand Down Expand Up @@ -1820,7 +1827,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"au.anthropic.claude-sonnet-5": {
"cache_creation_input_token_cost": 2.75e-06,
Expand Down Expand Up @@ -1854,7 +1862,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"jp.anthropic.claude-sonnet-5": {
"cache_creation_input_token_cost": 2.75e-06,
Expand Down Expand Up @@ -1888,7 +1897,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"anthropic.claude-sonnet-4-6": {
"supports_adaptive_thinking": true,
Expand Down
30 changes: 20 additions & 10 deletions model_prices_and_context_window.json
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1374,7 +1374,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"global.anthropic.claude-fable-5": {
"cache_creation_input_token_cost": 1.25e-05,
Expand Down Expand Up @@ -1408,7 +1409,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"us.anthropic.claude-fable-5": {
"cache_creation_input_token_cost": 1.375e-05,
Expand Down Expand Up @@ -1442,7 +1444,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"eu.anthropic.claude-fable-5": {
"cache_creation_input_token_cost": 1.375e-05,
Expand Down Expand Up @@ -1476,7 +1479,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"anthropic.claude-opus-4-8": {
"bedrock_converse_supports_strict_tools": false,
Expand Down Expand Up @@ -1718,7 +1722,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"global.anthropic.claude-sonnet-5": {
"cache_creation_input_token_cost": 2.5e-06,
Expand Down Expand Up @@ -1752,7 +1757,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"us.anthropic.claude-sonnet-5": {
"cache_creation_input_token_cost": 2.75e-06,
Expand Down Expand Up @@ -1786,7 +1792,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"eu.anthropic.claude-sonnet-5": {
"cache_creation_input_token_cost": 2.75e-06,
Expand Down Expand Up @@ -1820,7 +1827,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"au.anthropic.claude-sonnet-5": {
"cache_creation_input_token_cost": 2.75e-06,
Expand Down Expand Up @@ -1854,7 +1862,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"jp.anthropic.claude-sonnet-5": {
"cache_creation_input_token_cost": 2.75e-06,
Expand Down Expand Up @@ -1888,7 +1897,8 @@
"supports_max_reasoning_effort": true,
"supports_output_config": true,
"bedrock_output_config_effort_ceiling": "xhigh",
"supports_parallel_tool_use_config": true
"supports_parallel_tool_use_config": true,
"bedrock_converse_supports_strict_tools": false
},
"anthropic.claude-sonnet-4-6": {
"supports_adaptive_thinking": true,
Expand Down
33 changes: 32 additions & 1 deletion ...ellm/litellm_core_utils/prompt_templates/test_bedrock_converse_strict_tools_opus_47_48.py
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -48,12 +48,28 @@
"bedrock/us.anthropic.claude-sonnet-4-20250514-v1:0",
"bedrock/eu.anthropic.claude-sonnet-4-20250514-v1:0",
"bedrock/apac.anthropic.claude-sonnet-4-20250514-v1:0",
# Sonnet 5 rejects toolSpec.strict on Bedrock Converse too (verified
# against a live Converse call: strict -> ValidationException
# "tools.0.custom.strict: Extra inputs are not permitted", stripped -> 200).
"anthropic.claude-sonnet-5",
"bedrock/global.anthropic.claude-sonnet-5",
"bedrock/us.anthropic.claude-sonnet-5",
"bedrock/eu.anthropic.claude-sonnet-5",
"bedrock/au.anthropic.claude-sonnet-5",
"bedrock/jp.anthropic.claude-sonnet-5",
# Fable 5 likewise rejects toolSpec.strict on Bedrock Converse (verified
# live: strict -> "tools.0.custom.strict: Extra inputs are not permitted",
# stripped -> 200).
"anthropic.claude-fable-5",
"bedrock/global.anthropic.claude-fable-5",
"bedrock/us.anthropic.claude-fable-5",
"bedrock/eu.anthropic.claude-fable-5",
],
)
def test_bedrock_tools_pt_strict_dropped_for_strict_unsupported_models(
model_id: str,
) -> None:
"""Opus 4.7/4.8 and Sonnet 4 reject toolSpec.strict and additionalProperties."""
"""Opus 4.7/4.8, Sonnet 4, Sonnet 5, and Fable 5 reject toolSpec.strict and additionalProperties."""
result = _bedrock_tools_pt(_STRICT_TOOL, model=model_id)
tool_spec = result[0]["toolSpec"]
assert (
Expand Down Expand Up @@ -129,6 +145,11 @@ def test_bedrock_converse_supports_strict_tools_helper() -> None:
)
is False
)
# Sonnet 5 and Fable 5 reject strict on Bedrock Converse too
assert bedrock_converse_supports_strict_tools("bedrock/us.anthropic.claude-sonnet-5") is False
assert bedrock_converse_supports_strict_tools("anthropic.claude-sonnet-5") is False
assert bedrock_converse_supports_strict_tools("bedrock/us.anthropic.claude-fable-5") is False
assert bedrock_converse_supports_strict_tools("anthropic.claude-fable-5") is False


@pytest.mark.parametrize(
Expand All @@ -143,6 +164,16 @@ def test_bedrock_converse_supports_strict_tools_helper() -> None:
"us.anthropic.claude-sonnet-4-20250514-v1:0",
"eu.anthropic.claude-sonnet-4-20250514-v1:0",
"apac.anthropic.claude-sonnet-4-20250514-v1:0",
"anthropic.claude-sonnet-5",
"global.anthropic.claude-sonnet-5",
"us.anthropic.claude-sonnet-5",
"eu.anthropic.claude-sonnet-5",
"au.anthropic.claude-sonnet-5",
"jp.anthropic.claude-sonnet-5",
"anthropic.claude-fable-5",
"global.anthropic.claude-fable-5",
"us.anthropic.claude-fable-5",
"eu.anthropic.claude-fable-5",
],
)
def test_strict_tools_flag_set_in_model_cost_map(cost_map_key: str) -> None:
Expand Down
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