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    Anthropic · OpenAI

    Claude Mythos 5 vs GPT-5.5 Thinking

    Compare Claude Mythos 5 (Anthropic) and GPT-5.5 Thinking (OpenAI) on benchmarks, capabilities, and pricing.

    At a glance

    Claude Mythos 5GPT-5.5 Thinking
    ProviderAnthropicOpenAI
    Context1M tokens1M tokens
    ModalityMultimodalMultimodal
    PricingMaxMax
    SpeedMediumSlow
    ReasoningExpertExpert

    Benchmarks

    Claude Mythos 5

    AA Intelligence Index
    62points
    Estimated · As of Aug 11, 2026Stale · 31d old
    Output speed
    63tokens/s
    Estimated · As of Aug 11, 2026Stale · 31d old
    API input cost
    Not available
    API output cost
    Not available
    Context window
    1M
    Estimated · As of Aug 11, 2026Stale · 31d old

    AA measurements unavailable

    GPT-5.5 Thinking

    AA Intelligence Index
    56points
    Estimated · As of Aug 11, 2026Stale · 31d old
    Output speed
    52tokens/s
    Estimated · As of Aug 11, 2026Stale · 31d old
    API input cost
    Not available
    API output cost
    Not available
    Context window
    1M
    Estimated · As of Aug 11, 2026Stale · 31d old

    AA measurements unavailable

    Try both on yno.ai

    Switch between Claude Mythos 5 and GPT-5.5 Thinking per task with one account.

    Frequently asked

    Which is faster, Claude Mythos 5 or GPT-5.5 Thinking?
    Claude Mythos 5 is rated medium and GPT-5.5 Thinking is rated slow. yno.ai surfaces output-speed scores from Artificial Analysis on each model's detail page so you can compare exact tokens-per-second figures for your workload.
    Which is cheaper, Claude Mythos 5 or GPT-5.5 Thinking?
    Claude Mythos 5 is on the max tier in yno.ai; GPT-5.5 Thinking is on the max tier. See the pricing page for the latest per-tier limits.
    Which is better for Long-horizon agents?
    Both models support Long-horizon agents. Claude Mythos 5 brings Fable 5-class capability; GPT-5.5 Thinking brings Reasoning summaries. Run a side-by-side eval on your prompts in yno.ai to see which fits your workload.
    Can I use both Claude Mythos 5 and GPT-5.5 Thinking in yno.ai?
    Yes. Both are available on yno.ai under your single account; you can route different stages of an agent to different models or A/B test them on the same prompt without per-provider boilerplate.

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