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    GPT-oss 120B API pricing

    OpenAI model · OpenAI on AIWiseRank

    Short answer

    GPT-oss 120B by OpenAI costs $0.15 per 1M input tokens and $0.60 per 1M output tokens, with a 128K token context window. It scores 33.6% on SWE-bench Verified. GLM-5.3 Flash scores about as well on SWE-bench Verified (92%) for $0.24 per 1M blended tokens versus $0.26.

    Prices updated Oct 23, 2026 (APIpulse, CC BY 4.0) · Benchmarks: ARC Prize, Vals.ai · all models

    Input$0.15 / 1M
    Output$0.60 / 1M
    Context128K
    Blended (3:1)$0.26 / 1M

    API cost calculator

    Enter your monthly usage in millions of tokens (1M tokens ≈ 750,000 words).

    GPT-oss 120B$2.70 / month$32.40 / year

    Standard rates; batch processing and prompt caching can lower the bill.

    Benchmarks

    ARC-AGI-2 (reasoning)—
    SWE-bench Verified (coding)33.6%

    Cheaper models with similar scores

    Within 3 points on the same benchmark, at a lower blended price.

    Other OpenAI models

    ModelInput / 1MOutput / 1M
    GPT-6.1 Sol$2$10
    GPT-6 Astra$10$50
    GPT-6 Sol$2$10
    GPT-6 Luna$0.10$0.50
    GPT-5.6 Cyber$12.50$75
    GPT-5.6 Sol$4$20
    GPT-5.6 Terra$2$12
    GPT-5.6 Luna$0.20$1.20

    Frequently asked questions

    How much does the GPT-oss 120B API cost?

    GPT-oss 120B costs $0.15 per 1M input tokens and $0.60 per 1M output tokens. A workload of 10M input and 2M output tokens a month costs $2.70.

    What is the context window of GPT-oss 120B?

    GPT-oss 120B supports a 128K token context window.

    Is there a cheaper alternative to GPT-oss 120B?

    GLM-5.3 Flash scores 92% on SWE-bench Verified, close to GPT-oss 120B, at $0.24 per 1M blended tokens versus $0.26.