Auriko’s POST /v1/chat/completions endpoint accepts the parameters below. The endpoint is OpenAI-compatible with Auriko-specific extensions for routing and metadata.
Not all providers support every optional parameter. Auriko drops unsupported ones and includes a warning in routing_metadata.warnings.
require_parameters to true. Check which parameters each provider supports via the model directory endpoint.
Supported parameters
Auriko accepts and forwards 32 parameters to providers.
| Parameter | Type | Required | Description |
|---|
extensions | Extensions | No | |
frequency_penalty | number | No | Frequency penalty (-2 to 2). Not supported by all providers. |
gateway | object | Conditional | Auriko routing, metadata, and multi-model configuration. Omit for default single-model routing. |
logit_bias | object | No | Token logit bias. Not supported by all providers. |
logprobs | boolean | No | Return log probabilities. Not supported by all providers. |
max_completion_tokens | integer | No | Maximum tokens to generate. Reasoning models (o1/o3) use this field instead of max_tokens. |
max_tokens | integer | No | Maximum tokens to generate (legacy, use max_completion_tokens) |
messages | Message[] | Yes | The messages to generate a completion for |
min_p | number | No | Min-P sampling. Supported by some vLLM providers. |
model | string | Conditional | Model to route to, required for single-model requests. |
n | integer | No | Number of completions to generate. Not supported by all providers. |
parallel_tool_calls | boolean | No | Allow parallel tool calls |
presence_penalty | number | No | Presence penalty (-2 to 2). Not supported by all providers. |
prompt_cache_key | string | No | Prompt caching identifier. Supported by OpenAI. |
reasoning_effort | string | No | Controls reasoning effort for supported models. |
repetition_penalty | number | No | Repetition penalty. Supported by vLLM providers. |
response_format | ResponseFormat | No | |
safety_identifier | string | No | Safety policy identifier. Supported by OpenAI. |
seed | integer | No | Random seed for reproducibility |
stop | string | array | No | Stop sequences. Restrictions vary by provider and model. |
stream | boolean | No | Enable streaming responses |
stream_options | StreamOptions | No | |
temperature | number | No | Sampling temperature (0-2). Some providers restrict this value when reasoning is enabled. |
tool_choice | ToolChoice | No | |
tools | Tool[] | No | Tools the model can call |
top_a | number | No | Top-A sampling. Supported by some vLLM providers. |
top_k | integer | No | Top-K sampling. Restricted by some providers when reasoning is enabled. Supported by Anthropic, Google, and vLLM. |
top_logprobs | integer | No | Number of top logprobs to return. Requires logprobs support. |
top_p | number | No | Nucleus sampling parameter. Some providers restrict this value when reasoning is enabled. |
user | string | No | User identifier for abuse detection |
verbosity | string | No | Output verbosity control. Supported by OpenAI. |
web_search_options | object | No | Web search configuration. Supported by OpenAI. |
| Parameter | Transforms To | Reason |
|---|
function_call | tool_choice | deprecated by OpenAI, converted to tool_choice |
functions | tools | deprecated by OpenAI, converted to tools |
Accepted and dropped
These parameters are accepted but not forwarded to providers. A warning is included in routing_metadata.warnings.
| Parameter | Warning Message |
|---|
metadata | unsupported_field: metadata |
prediction | unsupported_field: prediction |
service_tier | unsupported_field: service_tier (use gateway.routing.optimize instead) |
store | unsupported_field: store |
Rejected with error
These parameters cause the request to fail with an error response.
| Parameter | Status | Error Code | Condition | Message |
|---|
audio | 400 | unsupported_modalities | always | audio output is not supported |
modalities | 400 | unsupported_modalities | when requesting audio output | audio output is not supported |
