OpenAI: GPT-5.1-Codex-Max

Public pricingIntelligence 79/100Large memory視覚深い思考ツール利用

OpenAI: GPT-5.1-Codex-Max はマルチモーダルモデルで、コーディング、ソフトウェア開発、エージェント業務に向いています。マルチモーダル入力処理、高いコーディング性能、400K tokensのコンテキスト、バランス型コストの特性を組み合わせ、コーディング、ソフトウェア開発、エージェント業務で安定した動作を支えます。精度・文脈・制御が重要な場面に合っており、安定した出力、柔軟な導入、拡張性を求めるチームに実用的です。安定した応答、長い文脈処理、そして試作から本番まで広く使える柔軟さが必要な場面で役立ちます。安定した応答、長い文脈処理、そして試作から本番まで広く使える柔軟さが必要な場面で役立ちます。安定した応答、長い文脈処理、そして試作から本番まで広く使える柔軟さが必要な場面で役立ちます。

Input

$1.25/1M

Output

$10.00/1M

Cached

$0.13/1M

Batch

$0.63/1M

Calculate your GPT-5.1-Codex-Max bill.

Set your workload — see cost at your exact volume.

What would GPT-5.1-Codex-Max cost you?

Adjust the workload to see your monthly bill.

Conversations per month50,000

1,00010,00050,000250,0001M10M

Input length

Output length

Repeated questions?

Replies can wait a few hours (batch discount)

Technical specifications

GPT-5.1-Codex-Max at a glance.

Memory

400,000

tokens

Max reply

128,000

tokens

Memory tier

Large

an entire book or large codebase

Tokenizer

tiktoken-o200k

Released

Dec 2025

Training cutoff

Jul 2025

Availability

Public pricing

Status

active

What it can do

Capabilities & limits.

Understands images
Deep step-by-step thinking
Uses tools / calls functions
Strict JSON output
Streams replies
Fine-tunable on your data

When to pick GPT-5.1-Codex-Max

Multi-step reasoning, research agents, or hard math.
Screenshot analysis, image understanding, or document OCR.
Agentic workflows that call tools or APIs.
Long documents, full codebases, or extensive chat histories.

When to look elsewhere

Very latency-sensitive, real-time apps where every millisecond counts.

Alternatives

Similar models to compare.

FAQ

GPT-5.1-Codex-Max — the questions we see most.

Pricing, capabilities, alternatives — generated from the same data that powers the calculator above.

Get instant answers from our AI agent

At a typical workload of 50,000 conversations a month with 1,500-token prompts and 800-token replies, GPT-5.1-Codex-Max costs roughly $494 per month. Input is $1.25 /1M tokens and output is $10.00 /1M tokens.

GPT-5.1-Codex-Max has a 400,000-token context window (large memory — an entire book or large codebase). That means you can fit about 75,000 words of input and history in a single call.

Beyond text generation, GPT-5.1-Codex-Max supports understanding images, deep step-by-step reasoning, calling functions / tools, strict JSON output, fine-tuning on your own data. It streams replies by default.

GPT-5.1-Codex-Max was released in December 2025, with training data cut off around July 2025.

Models in a similar class include GPT-5, GPT-5 Codex, GPT-5.1. The "Similar models" section below this FAQ links into each.

Still unsure?

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