ToAPIs

Quick Answer

  • Best for high-complexity reasoning, planning, and code analysis workflows.
  • Uses OpenAI-compatible format: POST /v1/chat/completions for low-friction SDK migration.
  • Supports stream=true SSE output for IDE copilots and real-time assistants.

Key Parameters

  • model | string | required | gpt-5-4-mini-official | - | Model ID for this page (for example gpt-5-4-mini-official).
  • messages | object[] | required | - | - | Conversation messages in chronological order with system/user/assistant roles.
  • max_tokens | integer | optional | - | >=1 | Maximum output tokens (model default applies when omitted).
  • stream | boolean | optional | false | - | Whether to enable SSE streaming output.
  • temperature | number | optional | 1 | 0-2 | Sampling temperature controlling randomness.
  • top_p | number | optional | 1 | 0-1 | Nucleus sampling threshold; avoid aggressively tuning with temperature together.
  • stop | string | string[] | optional | - | - | Stop sequence(s), up to 4 entries.
  • Authorization | HTTP Header | required | - | - | Bearer auth: Authorization: Bearer <YOUR_API_KEY>.

Common Errors

  • 400 invalid_request_error: trigger=Missing required fields or invalid field types in payload.; fix=Validate model, messages, and parameter types.; retry=Retry only after fixing payload.
  • 401 authentication_error: trigger=Missing/invalid auth header or invalid API key.; fix=Verify Authorization header format and key validity.; retry=Retry after auth is fixed.
  • 429 rate_limit_error: trigger=Request rate, concurrency, or current quota hits upstream rate limiting.; fix=Apply exponential backoff first, then review request rate, concurrency, and quota usage.; retry=Use 1s/2s/4s backoff with jitter; if it persists, reduce submission pressure.
Back to Market

Model Guide

Gpt 5 4 Mini Official

Model ID: gpt-5-4-mini-official

Vendor: OpenAIModalities: ChatPrice: Input $0.60/1M, Output $3.60/1MUpdated: 2026-05-02

Gpt 5 4 Mini Official is a high-end general model for complex reasoning and high-quality text/code generation. This page focuses on OpenAI Chat Completions integration, key parameters, and production-oriented implementation.

Open in PlaygroundDocs

Model Overview

Quick Answer

  • Best for high-complexity reasoning, planning, and code analysis workflows.
  • Uses OpenAI-compatible format: POST /v1/chat/completions for low-friction SDK migration.
  • Supports stream=true SSE output for IDE copilots and real-time assistants.

Gpt 5 4 Mini Official Model Features

Core Section

Core capabilities and practical engineering value

Complex reasoning and decomposition

Strong at long-chain reasoning, option comparison, and constraint-aware planning.

High-quality code and technical writing

Useful for code explanation, refactoring proposals, tests, and technical drafts.

OpenAI-compatible integration

Reuses Chat Completions payloads and existing SDK pipelines with minimal changes.

Streaming for real-time UX

Supports stream=true for progressive rendering in interactive applications.

Output controllability

Tune style and determinism with system prompts, temperature, top_p, and stop.

Production-ready operation

Works well with auth, retries, rate controls, and observability practices.

How to Use Gpt 5 4 Mini Official API

  1. Create an API key and set Authorization: Bearer <YOUR_API_KEY>.
  2. POST to /v1/chat/completions with at least model and messages.
  3. Tune max_tokens, temperature, top_p, and stop for your scenario.
  4. Enable stream=true and process SSE chunks for real-time rendering.
  5. Finalize with finish_reason and usage metrics for observability.
Gpt 5 4 Mini Official

When to Use

  • When handling complex reasoning, technical evaluation, and coding analysis tasks.
  • When you want OpenAI-compatible integration with minimal migration work.
  • When streaming output is needed for responsive interactive UX.

Runtime Behavior

  • Requests are sent to POST /v1/chat/completions using OpenAI Chat Completions format.
  • stream=true returns SSE chunks, while stream=false returns a full response.
  • Use choices and finish_reason for completion handling, with usage for token accounting.
Gpt 5 4 Mini Official

Key Parameters

ParameterTypeRequiredDefaultRangeDescription
modelstringYesgpt-5-4-mini-official-Model ID for this page (for example gpt-5-4-mini-official).
messagesobject[]Yes--Conversation messages in chronological order with system/user/assistant roles.
max_tokensintegerNo->=1Maximum output tokens (model default applies when omitted).
streambooleanNofalse-Whether to enable SSE streaming output.
temperaturenumberNo10-2Sampling temperature controlling randomness.
top_pnumberNo10-1Nucleus sampling threshold; avoid aggressively tuning with temperature together.
stopstring | string[]No--Stop sequence(s), up to 4 entries.
AuthorizationHTTP HeaderYes--Bearer auth: Authorization: Bearer <YOUR_API_KEY>.

Common Errors

400 invalid_request_error

Trigger: Missing required fields or invalid field types in payload.

Fix: Validate model, messages, and parameter types.

Retry: Retry only after fixing payload.

401 authentication_error

Trigger: Missing/invalid auth header or invalid API key.

Fix: Verify Authorization header format and key validity.

Retry: Retry after auth is fixed.

429 rate_limit_error

Trigger: Request rate, concurrency, or current quota hits upstream rate limiting.

Fix: Apply exponential backoff first, then review request rate, concurrency, and quota usage.

Retry: Use 1s/2s/4s backoff with jitter; if it persists, reduce submission pressure.

FAQ

What is Gpt 5 4 Mini Official best for?

It is best for complex reasoning, technical Q&A, code analysis, and high-quality content generation.

What is the fastest integration path?

Use OpenAI-compatible format: POST to /v1/chat/completions with model and messages.

How should streaming be handled?

Set stream=true and process SSE chunks incrementally, then finalize using finish_reason.

How to choose temperature vs top_p?

Start with temperature first; tune top_p only when needed, and avoid over-tuning both together.

Mode Notes

Chat Completions with Gpt 5 4 Mini Official

OpenAI-compatible endpoint for low-friction SDK reuse.

Mode Parameters

modelmessagesmax_tokenstemperaturetop_pstopstream

Best Scenarios

  • General Q&A assistants
  • Code explanation and refactor guidance
  • Technical writing

Streaming with Gpt 5 4 Mini Official

Enable stream for incremental SSE output in real-time interfaces.

Mode Parameters

streammessagesmax_tokens

Best Scenarios

  • IDE copilots
  • Progressive chat rendering
  • Terminal assistants

Tool Calling with Gpt 5 4 Mini Official

Extend with external tools/functions where tool-capable workflows are enabled.

Mode Parameters

toolstool_choicemessagesmax_tokens

Best Scenarios

  • RAG-style assistant
  • Automated test execution
  • Multi-step agent workflows

Related APIs

Ready to unify your AI model access?

Start free, use the market page to shortlist models, and use pricing to confirm cost and default routing strategy

Start for FreeView Pricing
ToAPIs

Enterprise AI API Gateway. Access GPT-5, Claude, Gemini and 50+ models through one unified API.

Legal

© 2026 ToAPIs. All rights reserved.

All systems operational