OpenAI: GPT-5.1-Codex-Max

Public pricingIntelligence 79/100Large memory่ฆ–่ฆšๆทฑใ„ๆ€่€ƒใƒ„ใƒผใƒซๅˆฉ็”จ

OpenAI: GPT-5.1-Codex-Max ใฏ ใƒžใƒซใƒใƒขใƒผใƒ€ใƒซ ใƒขใƒ‡ใƒซใงใ€ใ‚ณใƒผใƒ‡ใ‚ฃใƒณใ‚ฐใ€ใ‚ฝใƒ•ใƒˆใ‚ฆใ‚งใ‚ข้–‹็™บใ€ใ‚จใƒผใ‚ธใ‚งใƒณใƒˆๆฅญๅ‹™ ใซๅ‘ใ„ใฆใ„ใพใ™ใ€‚ใƒžใƒซใƒใƒขใƒผใƒ€ใƒซๅ…ฅๅŠ›ๅ‡ฆ็†ใ€้ซ˜ใ„ใ‚ณใƒผใƒ‡ใ‚ฃใƒณใ‚ฐๆ€ง่ƒฝใ€400K tokensใฎใ‚ณใƒณใƒ†ใ‚ญใ‚นใƒˆใ€ใƒใƒฉใƒณใ‚นๅž‹ใ‚ณใ‚นใƒˆใฎ็‰นๆ€งใ‚’็ต„ใฟๅˆใ‚ใ›ใ€ใ‚ณใƒผใƒ‡ใ‚ฃใƒณใ‚ฐใ€ใ‚ฝใƒ•ใƒˆใ‚ฆใ‚งใ‚ข้–‹็™บใ€ใ‚จใƒผใ‚ธใ‚งใƒณใƒˆๆฅญๅ‹™ ใงๅฎ‰ๅฎšใ—ใŸๅ‹•ไฝœใ‚’ๆ”ฏใˆใพใ™ใ€‚็ฒพๅบฆใƒปๆ–‡่„ˆใƒปๅˆถๅพก ใŒ้‡่ฆใชๅ ด้ขใซๅˆใฃใฆใŠใ‚Šใ€ๅฎ‰ๅฎšใ—ใŸๅ‡บๅŠ›ใ€ๆŸ”่ปŸใชๅฐŽๅ…ฅใ€ๆ‹กๅผตๆ€งใ‚’ๆฑ‚ใ‚ใ‚‹ใƒใƒผใƒ ใซๅฎŸ็”จ็š„ใงใ™ใ€‚ ๅฎ‰ๅฎšใ—ใŸๅฟœ็ญ”ใ€้•ทใ„ๆ–‡่„ˆๅ‡ฆ็†ใ€ใใ—ใฆ่ฉฆไฝœใ‹ใ‚‰ๆœฌ็•ชใพใงๅบƒใไฝฟใˆใ‚‹ๆŸ”่ปŸใ•ใŒๅฟ…่ฆใชๅ ด้ขใงๅฝน็ซ‹ใกใพใ™ใ€‚ ๅฎ‰ๅฎšใ—ใŸๅฟœ็ญ”ใ€้•ทใ„ๆ–‡่„ˆๅ‡ฆ็†ใ€ใใ—ใฆ่ฉฆไฝœใ‹ใ‚‰ๆœฌ็•ชใพใงๅบƒใไฝฟใˆใ‚‹ๆŸ”่ปŸใ•ใŒๅฟ…่ฆใชๅ ด้ขใงๅฝน็ซ‹ใกใพใ™ใ€‚ ๅฎ‰ๅฎšใ—ใŸๅฟœ็ญ”ใ€้•ทใ„ๆ–‡่„ˆๅ‡ฆ็†ใ€ใใ—ใฆ่ฉฆไฝœใ‹ใ‚‰ๆœฌ็•ชใพใงๅบƒใไฝฟใˆใ‚‹ๆŸ”่ปŸใ•ใŒๅฟ…่ฆใชๅ ด้ขใงๅฝน็ซ‹ใกใพใ™ใ€‚

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 โ€” see cost at your exact volume.

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

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1,00010,00050,000250,0001M10M

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.

FAQ

GPT-5.1-Codex-Max โ€” the questions we see most.

Pricing, capabilities, alternatives โ€” 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 โ€” 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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