OpenAI: GPT-5.1 Chat

Public pricingIntelligence 80/100Medium memory視覚ツール利用

OpenAI: GPT-5.1 Chat は マルチモーダル モデルで、マルチモーダル推論と分析 に向いています。マルチモーダル入力処理、深い推論と計画、128K 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、マルチモーダル推論と分析 で安定した動作を支えます。遅延・コスト・スループット 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。 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

$0.31/1M

Calculate your GPT-5.1 Chat bill.

Set your workload — see cost at your exact volume.

What would GPT-5.1 Chat cost you?

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1,00010,00050,000250,0001M10M

Technical specifications

GPT-5.1 Chat at a glance.

Memory

128,000

tokens

Max reply

16,384

tokens

Memory tier

Medium

a long report or a codebase file

Tokenizer

tiktoken-o200k

Released

Nov 2025

Training cutoff

Jul 2025

Availability

Public pricing

Status

active

Benchmarks

Quality benchmarks

Independent evaluations from public leaderboards. Higher is better.

  • swe_bench_verified

    67.98

  • frontiermath_tier_4

    4.17

  • gpqa_diamond

    85.04

  • humanitys_last_exam

    23.68

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 Chat

  • Screenshot analysis, image understanding, or document OCR.
  • Agentic workflows that call tools or APIs.
  • Code generation, review, or refactoring.
  • Multimodal pipelines mixing text + images.

When to look elsewhere

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

Alternatives

Similar models to compare.

FAQ

GPT-5.1 Chat — 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 Chat costs roughly $494 per month. Input is $1.25 /1M tokens and output is $10.00 /1M tokens.
GPT-5.1 Chat has a 128,000-token context window (medium memory — a long report or a codebase file). That means you can fit about 24,000 words of input and history in a single call.
Beyond text generation, GPT-5.1 Chat supports understanding images, calling functions / tools, strict JSON output, fine-tuning on your own data. It streams replies by default.
GPT-5.1 Chat was released in November 2025, with training data cut off around July 2025.
Models in a similar class include GPT-5, GPT-5 Chat, GPT-5 Codex. The "Similar models" section below this FAQ links into each.

Still unsure?

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