OpenAI: GPT-5.1-Codex-Max

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GPT-5.1-Codex-Max is OpenAI's agentic coding model, released 2025-12, built for long-running, high-context software development. It uses an updated version of the 5.1 reasoning stack and is trained on agentic workflows across software engineering, mathematics, and research, with faster performance and higher token efficiency.

MirAPI doesn’t offer this model. The prices shown are the official list prices.

Modalities
inTextinImageoutText
Price / 1M
$1.25 / $10.00
Context
400K
Released
Dec 4, 2025

Capabilities

ReasoningVisionTool useLong contextPrompt cachingStructured output

Parameters

Request parameters this model accepts through the API.

include_reasoningmax_completion_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetoolsverbosity

Showcase

Every chat model gets the same three fixed prompts. Outputs are archived verbatim, so you can copy a prompt and reproduce the result.

Task prompt · identical for all models
Build a single-file HTML page using three.js from a CDN: a low-poly planet with a tilted ring of ~200 orbiting particles, a soft key light plus rim light, slow auto-rotation, and drag-to-orbit controls. No build tools — one file only.
Archived output
Archive not published yet

Every model will run this exact prompt, and its output will appear here verbatim with token counts and the cost per run.

Quick start

import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.mirapi.ai/v1",   # changed
    api_key=os.environ["MIRAPI_API_KEY"],   # changed
)

resp = client.chat.completions.create(
    model="",
    messages=[{"role": "user", "content": "Hello"}],
)
Wire GPT-5.1-Codex-Max into your product

1M free tokens to start, no card required. It’s OpenAI-compatible, so you only change the base URL.

Start free