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[Feat]Add day 0 claude sonnet 4.6 feat support #21448

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Merged
Sameerlite merged 6 commits into from
Feb 18, 2026
Merged

[Feat]Add day 0 claude sonnet 4.6 feat support #21448

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2bbae68
Add sonnet-4.6 for tool use
Sameerlite Feb 18, 2026
0cb56c9
Add mapping for thinking and response format
Sameerlite Feb 18, 2026
bdba316
Add inference_geo: us costing
Sameerlite Feb 18, 2026
892b9ac
Add other provider feats
Sameerlite Feb 18, 2026
e0b28a1
Add other provider feats
Sameerlite Feb 18, 2026
f6d3919
Merge branch 'main' into litellm_sonnet_4_6_feat
Sameerlite Feb 18, 2026
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8 changes: 6 additions & 2 deletions litellm/llms/anthropic/chat/transformation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -172,8 +172,8 @@ def convert_tool_use_to_openai_format(

@staticmethod
def _is_claude_opus_4_6(model: str) -> bool:
"""Check if the model is Claude Opus 4.5."""
return "opus-4-6" in model.lower() or "opus_4_6" in model.lower()
"""Check if the model is Claude Opus 4.5 or Sonnet 4.6."""
return "opus-4-6" in model.lower() or "opus_4_6" in model.lower() or "sonnet-4-6" in model.lower() or "sonnet_4_6" in model.lower()

@greptile-apps greptile-apps Bot Feb 18, 2026

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Misleading method name and docstring

The method _is_claude_opus_4_6 now also checks for Sonnet 4.6 models, but the name still says "opus". The docstring was updated to mention "Sonnet 4.6" but still says "Opus 4.5" instead of "Opus 4.6". This causes confusion at all 3 call sites (lines 713, 1293). Consider renaming to something like _is_adaptive_thinking_model or _is_claude_4_6_family to accurately reflect what it checks.

Additionally, the _is_claude_opus_4_6 method is missing the dot-separated variants ("sonnet-4.6", "opus-4.6"). The Bedrock _supports_tool_search_on_bedrock method and the response_format check both include these dot variants, but this method does not. Models like vercel_ai_gateway/anthropic/claude-opus-4.6 in the pricing JSON use dot separators and would not be matched.


def get_supported_openai_params(self, model: str):
params = [
Expand Down Expand Up @@ -881,6 +881,10 @@ def map_openai_params( # noqa: PLR0915
"opus-4-5",
"opus-4.6",
"opus-4-6",
"sonnet-4.6",
"sonnet-4-6",
"sonnet_4.6",
"sonnet_4_6",
}
):
_output_format = (
Expand Down
9 changes: 6 additions & 3 deletions litellm/llms/bedrock/messages/invoke_transformations/anthropic_claude3_transformation.py
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Expand Up @@ -251,6 +251,11 @@ def _supports_tool_search_on_bedrock(self, model: str) -> bool:
"opus_4.6",
"opus-4-6",
"opus_4_6",
#sonnet 4.6

@greptile-apps greptile-apps Bot Feb 18, 2026

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Missing space in comment

Minor formatting issue — existing comments in this list use # Opus 4.5 format (space after #), but this one uses #sonnet 4.6 without a space and without capitalization.

Suggested change
#sonnet 4.6
# Sonnet 4.6

"sonnet-4.6",
"sonnet_4.6",
"sonnet-4-6",
"sonnet_4_6",
]

return any(pattern in model_lower for pattern in supported_patterns)
Expand Down Expand Up @@ -285,7 +290,7 @@ def _get_tool_search_beta_header_for_bedrock(
programmatic_tool_calling_used or input_examples_used
):
beta_set.discard(ANTHROPIC_TOOL_SEARCH_BETA_HEADER)
if "opus-4" in model.lower() or "opus_4" in model.lower():
if self._supports_tool_search_on_bedrock(model):
beta_set.add("tool-search-tool-2025-10-19")

def _convert_output_format_to_inline_schema(
Expand Down Expand Up @@ -420,10 +425,8 @@ def transform_anthropic_messages_request(
beta_set=beta_set,
)

# --- Custom logic: if tool-search-tool-2025-10-19 is present, add tool-examples-2025-10-29 ---
if "tool-search-tool-2025-10-19" in beta_set:
beta_set.add("tool-examples-2025-10-29")
# ------------------------------------------------------------------------------

if beta_set:
anthropic_messages_request["anthropic_beta"] = list(beta_set)
Expand Down
31 changes: 31 additions & 0 deletions litellm/model_prices_and_context_window_backup.json
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Original file line number Diff line number Diff line change
Expand Up @@ -8294,6 +8294,37 @@
"supports_vision": true,
"tool_use_system_prompt_tokens": 346
},
"us/claude-sonnet-4-6": {
"cache_creation_input_token_cost": 4.125e-06,
"cache_creation_input_token_cost_above_200k_tokens": 8.25e-06,
"cache_read_input_token_cost": 3.3e-07,
"cache_read_input_token_cost_above_200k_tokens": 6.6e-07,
"input_cost_per_token": 3.3e-06,
"input_cost_per_token_above_200k_tokens": 6.6e-06,
"litellm_provider": "anthropic",
"max_input_tokens": 200000,
"max_output_tokens": 64000,
"max_tokens": 64000,
"mode": "chat",
"output_cost_per_token": 1.65e-05,
"output_cost_per_token_above_200k_tokens": 2.475e-05,
"search_context_cost_per_query": {
"search_context_size_high": 0.01,
"search_context_size_low": 0.01,
"search_context_size_medium": 0.01
},
"supports_assistant_prefill": true,
"supports_computer_use": true,
"supports_function_calling": true,
"supports_pdf_input": true,
"supports_prompt_caching": true,
"supports_reasoning": true,
"supports_response_schema": true,
"supports_tool_choice": true,
"supports_vision": true,
"tool_use_system_prompt_tokens": 346,
"inference_geo": "us"
},
"claude-sonnet-4-5-20250929-v1:0": {
"cache_creation_input_token_cost": 3.75e-06,
"cache_read_input_token_cost": 3e-07,
Expand Down
31 changes: 31 additions & 0 deletions model_prices_and_context_window.json
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -8294,6 +8294,37 @@
"supports_vision": true,
"tool_use_system_prompt_tokens": 346
},
"us/claude-sonnet-4-6": {
"cache_creation_input_token_cost": 4.125e-06,
"cache_creation_input_token_cost_above_200k_tokens": 8.25e-06,
"cache_read_input_token_cost": 3.3e-07,
"cache_read_input_token_cost_above_200k_tokens": 6.6e-07,
"input_cost_per_token": 3.3e-06,
"input_cost_per_token_above_200k_tokens": 6.6e-06,
"litellm_provider": "anthropic",
"max_input_tokens": 200000,
"max_output_tokens": 64000,
"max_tokens": 64000,
"mode": "chat",
"output_cost_per_token": 1.65e-05,
"output_cost_per_token_above_200k_tokens": 2.475e-05,
"search_context_cost_per_query": {
"search_context_size_high": 0.01,
"search_context_size_low": 0.01,
"search_context_size_medium": 0.01
},
"supports_assistant_prefill": true,
"supports_computer_use": true,
"supports_function_calling": true,
"supports_pdf_input": true,
"supports_prompt_caching": true,
"supports_reasoning": true,
"supports_response_schema": true,
"supports_tool_choice": true,
"supports_vision": true,
"tool_use_system_prompt_tokens": 346,
"inference_geo": "us"
},
"claude-sonnet-4-5-20250929-v1:0": {
"cache_creation_input_token_cost": 3.75e-06,
"cache_read_input_token_cost": 3e-07,
Expand Down
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