OpenAI: gpt-oss-120b

Public pricingIntelligence 79/100Medium memoryDeep thinkingTool use

OpenAI: gpt-oss-120b is a text model for reasoning, planning, and automation. It combines reliable tool use and agent behavior and deep reasoning and planning with a 131K tokens context window and a low-cost profile. Use it for reasoning, planning, and multi-step automation when quality, speed, and cost matters.

Input

$0.04/1M

Output

$0.19/1M

Cached

$0.01/1M

Batch

$0.02/1M

Calculate your gpt-oss-120b bill.

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What would gpt-oss-120b cost you?

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Technical specifications

gpt-oss-120b at a glance.

Memory

131,072

tokens

Max reply

131,072

tokens

Memory tier

Medium

a long report or a codebase file

Tokenizer

tiktoken-o200k

Released

Aug 2025

Training cutoff

Oct 2024

Availability

Public pricing

Status

active

Benchmarks

Quality benchmarks

Independent evaluations from public leaderboards. Higher is better.

  • aa_intelligence_index

    37

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-oss-120b

  • Multi-step reasoning, research agents, or hard math.
  • Agentic workflows that call tools or APIs.
  • High-volume workloads where unit cost matters.

When to look elsewhere

  • Your workload involves images — pick a vision-capable model instead.

Alternatives

Similar models to compare.

FAQ

gpt-oss-120b — 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-oss-120b costs roughly $11 per month. Input is $0.04 /1M tokens and output is $0.19 /1M tokens.
gpt-oss-120b has a 131,072-token context window (medium memory — a long report or a codebase file). That means you can fit about 24,576 words of input and history in a single call.
Beyond text generation, gpt-oss-120b supports deep step-by-step reasoning, calling functions / tools, strict JSON output, fine-tuning on your own data. It streams replies by default.
gpt-oss-120b was released in August 2025, with training data cut off around October 2024.
Models in a similar class include gpt-oss-20b, GPT-5 Nano, gpt-oss-safeguard-20b. The "Similar models" section below this FAQ links into each.

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