Documentation Index
Fetch the complete documentation index at: /llms.txt
Use this file to discover all available pages before exploring further.
Use the OpenAI SDKs with the Fortytwo API, and the fields that differ from the OpenAI Chat Completions API.
| Setting | Value |
|---|---|
| Base URL | https://api.fortytwo.network/v1 |
| API key | A Fortytwo API key — see Get access |
OPENAI_BASE_URL and OPENAI_API_KEY.
The API rejects fields it does not support with 400 invalid_request. It does not ignore them. Check that your client does not add the fields listed as not supported below.
| Endpoint | Status |
|---|---|
POST /v1/chat/completions | Supported |
GET /v1/models | Supported. Entries have id, object, created, owned_by |
GET /v1/models/{id} | Not supported (404) |
| Responses, Completions, Embeddings, Audio, Images, Files, Batches, Fine-tuning, Moderations, Assistants | Not supported (404) |
| Field | Status | Difference |
|---|---|---|
model | Supported | A model ID from Models |
messages | Supported | See Messages |
stream | Supported | |
stream_options | Partly | Only include_usage, and only with stream: true |
max_tokens, max_completion_tokens | Supported | Send one of the two. Maximum: the model’s max output |
reasoning_effort | Supported | none, minimal, low, medium, high, xhigh, max. Default medium |
tools | Partly | Function tools only, up to 128 |
tool_choice | Supported | auto, none, required or a named function |
parallel_tool_calls | Supported | |
response_format | Partly | text, json_object, or json_schema with strict: true only |
n | Partly | Only 1 |
store | Partly | Only false — see Data handling |
temperature, top_p, presence_penalty, stop, seed | Per model | Accepted only if the model supports it; otherwise 400 — see Models |
frequency_penalty, logit_bias, logprobs, top_logprobs, top_a | Not supported | 400, whatever the value |
reasoning object | Not supported | Use reasoning_effort |
user, metadata, service_tier, prompt_cache_key, safety_identifier, verbosity | Not supported | 400 |
modalities, audio, prediction, web_search_options | Not supported | 400 |
functions, function_call (legacy) | Not supported | Use tools and tool_choice |
top_k, min_p and repetition_penalty for models that support them — see Chat completions.
| Item | Status | Difference |
|---|---|---|
Roles developer, system, user, assistant, tool | Supported | The legacy function role is not supported |
Message fields role, content, name, tool_calls, tool_call_id | Supported | Any other field returns 400 |
reasoning, reasoning_details, refusal in an assistant message | Not supported | Remove them before you send a reply back — 400 otherwise |
Content parts text | Supported | |
Content parts image_url | Supported | user messages only; PNG, JPEG, WebP — see Image input |
Content parts input_audio, file | Not supported | 400 unsupported_content_type |
cache_control on content parts | Not supported | Caching is automatic — see Prompt caching |
| Item | Difference |
|---|---|
choices[].message.reasoning, reasoning_details | Added: the model’s reasoning. Billed as output |
usage.prompt_tokens_details.cached_tokens | Prompt tokens served from the prompt cache |
model | The model ID from the request |
| Errors | The OpenAI error envelope plus a top-level request_id. Codes differ — see Errors |
| Stream errors | After a stream starts, every failure is one event with the code upstream_error — see Streaming |