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OpenAI

o4-mini

OpenAI o4-mini is a compact reasoning model in the o-series, optimized for fast, cost-efficient performance while retaining strong multimodal and agentic capabilities. It supports tool use and demonstrates competitive reasoning...

textAPI availablestreamingreasoningfunction tools
o4-miniVersion date 2025-04-16

Tokely price / 1M tokens

$2.022075input
$0.505519cached input
$8.0883output

USD · Published rate · Updated 2026-10-06

OpenRouter reference$1.1 input · $4.4 output / 1M tokensStandard listed rates · 2026-10-06

Context window

200,000tokens · model specification

Model max output

100,000tokens

First request

Available
curl https://tokely.me/v1/chat/completions \
  -H "Authorization: Bearer $TOKELY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "o4-mini",
    "messages": [{"role": "user", "content": "Hello!"}],
    "max_tokens": 256
  }'

Set TOKELY_API_KEY to your dashboard key. Requests require a funded Tokely balance. Base URL: https://tokely.me/v1.

Compare nearby prices

USD per million tokens. Compare price and context; these are not quality benchmarks.
ModelInputOutputContext
o4-miniOpenAI · this model$2.022075$8.0883200,000
o3-miniOpenAI$2.022075$8.0883200,000
o3-mini-2025-01-31OpenAI$2.022075$8.0883200,000
o4-mini-2025-04-16OpenAI$2.022075$8.0883200,000
kimi-k2.5Moonshot$1.65$8.6625262,144

Capabilities & limits

Provider
OpenAI
API model ID
o4-mini
Category
Text
Endpoints
POST /v1/chat/completionsPOST /v1/responses
Tokely max output
65,536 tokens / request, including reasoning tokens
Default output
256 tokens. Set an explicit limit for longer responses.
Request limits
256 KB JSON body · 128 messages · 32 function tools
Rate limit
60 requests / minute / account, across its keys
Supported input
Text messages and function tool results
Model modalities
image, text, file. Tokely currently accepts text input.

The context includes your instructions, conversation history, tool definitions and generated output. Keep the input and requested output within the model’s context window.

OpenRouter model reference

API reference

Authenticate with Authorization: Bearer YOUR_TOKELY_API_KEY. Use an OpenAI SDK with the Tokely base URL.

model
Required string: o4-mini
messages
An array of system, developer, user, assistant and tool messages.
max_tokens
Optional integer, 1–65,536. Defaults to 256.
stream
Set true for Server-Sent Events (SSE).
reasoning_effort
Optional reasoning effort. Supported values depend on the model; omit to use its default.
tools
Function definitions executed by your application. Provider-hosted tools are not enabled.

The response contains choices with message or tool_calls, finish_reason, and usage (prompt_tokens, completion_tokens, total_tokens). Streaming sends chat completion chunks.

400 / 415
Invalid request, parameter, endpoint for this model, or content type.
401 / 403
Invalid, revoked or restricted API key.
402
Insufficient account balance or API key budget.
429
Request limit reached. Retry after the indicated delay.
502 / 503 / 504
Upstream failure, temporary service unavailability or request timeout.

Frequently asked questions

How much does o4-mini cost?

$2.022075 per million input tokens, $8.0883 per million output tokens and $0.505519 per million cached input tokens. Usage is charged to your Tokely balance.

Do I need a separate OpenAI account?

Use your Tokely API key and balance. A separate provider key is not required.

How do I switch to this model?

Set model to o4-mini and use /v1/chat/completions. Keep your Tokely base URL and API key.

What is the context window?

200,000 tokens, including input and output. The Tokely request body and output limits listed above also apply.

Related versions

o4-mini-2025-04-162025-04-16