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    IOI

    🏆 Leaderboard

    As of August 31, 2026, Claude Opus 5 is #1 for IOI at 91.7%. Ranked by the IOI score 45 models in this index have a published IOI score. IOI leaderboard with live API prices. IOI — International Olympiad in Informatics programming contest problems.

    Updated August 31, 2026345 models36 providers

    IOI vs price

    45 models. Left is cheaper. Up is a higher score. The line is the best score you can buy at each price — a dot under it is a worse deal than something on the line.

    Best score at each price#1 on this board
    Claude Opus 5
    Anthropic · Proprietary
    		91.7%$30.00
    GPT-5.6 Sol
    OpenAI · Proprietary
    		86.7%$35.00
    Qwen3.8 MaxOSS
    Qwen · Open Source
    		73%$8.00
    GPT-5.6 Luna
    OpenAI · Proprietary
    		72.9%$1.40
    Claude Fable 5
    Anthropic · Proprietary
    		72.3%$60.00
    GPT-5.4
    OpenAI · Proprietary
    		67.8%$17.50
    GPT-5.6 Terra
    OpenAI · Proprietary
    		65.3%$14.00
    GPT-5.2
    OpenAI · Proprietary
    		54.8%$15.75
    Muse Spark 1.2
    Meta · Proprietary
    		49.5%$5.50
    Claude Opus 4.7
    Anthropic · Proprietary
    		47.1%$30.00
    Qwen3.7 Max
    Qwen · Proprietary
    		46.8%$5.00
    GPT-5.3 Codex
    OpenAI · Proprietary
    		43.8%$15.75
    Gemini 3 Flash
    Google · Proprietary
    		39.1%$3.50
    Gemini 3 Pro
    Google · Proprietary
    		38.8%$14.00
    DeepSeek-V4-Pro-0813OSS
    DeepSeek · Open Source
    		35.8%$5.28
    Gemini 3.5 Flash-Lite
    Google · Proprietary
    		26.2%$2.80
    Claude Opus 4.5
    Anthropic · Proprietary
    		23.6%$30.00
    GPT-5.1
    OpenAI · Proprietary
    		21.5%$11.25
    GPT-5.1 Codex
    OpenAI · Proprietary
    		21.4%$11.25
    GPT-5
    OpenAI · Proprietary
    		20%$11.25
    Gemini 2.5 Pro
    Google · Proprietary
    		17.1%$11.25
    Qwen3 Max
    Qwen · Proprietary
    		15.7%$5.50
    Grok 4.3
    xAI · Proprietary
    		15.3%$3.75
    GPT-5.4 nano
    OpenAI · Proprietary
    		15.3%$1.45
    Claude Opus 4.1
    Anthropic · Proprietary
    		12.5%$90.00
    Grok-4 Fast Reasoning
    xAI · Proprietary
    		11.5%$0.70
    GPT-5 Codex
    OpenAI · Proprietary
    		9.8%$11.25
    Grok-4.1 Fast Non-Reasoning
    xAI · Proprietary
    		7.7%$0.70
    GLM-4.7OSS
    Z AI · Open Source
    		7.6%$2.80
    GPT-5 mini
    OpenAI · Proprietary
    		6.8%$2.25
    MiniMax M2.5OSS
    MiniMax · Open Source
    		6.7%$1.50
    Claude Sonnet 4
    Anthropic · Proprietary
    		6.5%$18.00
    GPT-5.4 mini
    OpenAI · Proprietary
    		6.4%$5.25
    MiniMax M2.7OSS
    MiniMax · Open Source
    		4.9%$1.50
    o4-mini
    OpenAI · Proprietary
    		4.8%$5.50
    Grok Code Fast 1
    xAI · Proprietary
    		4.3%$1.70
    GLM-4.6OSS
    Z AI · Open Source
    		4.3%$2.80
    Grok-4 Fast Non-Reasoning
    xAI · Proprietary
    		3.8%$0.70
    Grok-4.1 Fast Reasoning
    xAI · Proprietary
    		3.1%$0.70
    GLM-4.5OSS
    Z AI · Open Source
    		2.9%$2.80
    Gemini 2.5 Flash
    Google · Proprietary
    		2.6%$2.80
    MiniMax M2.1OSS
    MiniMax · Open Source
    		2.3%$1.50
    DeepSeek-V3 0324OSS
    DeepSeek · Open Source
    		1.7%$1.42
    Kimi K2 InstructOSS
    Moonshot AI · Open Source
    		1.3%$1.00
    Qwen3 235B A22BOSS
    Qwen · Open Source
    		0%$0.20
    ChatGPT-4o Latest
    OpenAI · Proprietary
    		—$12.50
    Claude 3 Haiku
    Anthropic · Proprietary
    		—$1.50
    Claude 3 Opus
    Anthropic · Proprietary
    		—$90.00
    Claude 3 Sonnet
    Anthropic · Proprietary
    		—$18.00
    Claude 3.5 Haiku
    Anthropic · Proprietary
    		—$4.80
    Showing 1–50 of 345 models

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    The index

    All Large Language Models

    345 models across 36 providers. Search or jump to a lab — every model page stays linked here.

    OpenAI52Anthropic22Google34Cursor2xAI17DeepSeek20MiniMax7Qwen55AI21 Labs2Amazon7Baidu2ByteDance4Cohere4IBM2Inception1inclusionAI1LG AI Research1Liquid AI2Meituan4Meta12Microsoft9Mistral26Moonshot AI11Nous Research1NVIDIA9OpenBMB1Poolside2Sakana AI1Sarvam AI2StepFun2Tencent1Thinking Machines1Unisound1Upstage1Xiaomi5Z AI21

    Baidu

    2 models
    ERNIE 5.0ERNIE 4.5

    Inception

    1 models
    Mercury 2

    inclusionAI

    1 models
    Ling-3.0-flash

    LG AI Research

    1 models
    K-EXAONE-236B-A23B

    Liquid AI

    2 models
    LFM2.5-VL-3BLFM2.5-2.6B

    Nous Research

    1 models
    Hermes 3 70B

    OpenBMB

    1 models
    MiniCPM-SALA

    Sakana AI

    1 models
    Sakana Namazu

    Sarvam AI

    2 models
    Sarvam-105BSarvam-30B

    Tencent

    1 models
    Hy3

    Thinking Machines

    1 models
    Inkling-Small

    Unisound

    1 models
    U2

    Upstage

    1 models
    Solar Pro 4

    Which model leads IOI right now?

    As of August 31, 2026, Claude Opus 5 by Anthropic is #1 for IOI at 91.7%. Ranked by the IOI score This board also tracks IOI. Next on the same board: GPT-5.6 Sol and Qwen3.8 Max. This ioi leaderboard ranks models by IOI. Scores come from public evals. Prices are the live API rates in the table above.

    Sources: OpenAI API pricing (https://developers.openai.com/api/docs/pricing); Anthropic Claude API pricing (https://platform.claude.com/docs/en/about-claude/pricing); Gemini API pricing (https://ai.google.dev/gemini-api/docs/pricing)

    Top 8 for ioi. Ranked by the IOI score Input and output are dollars per million tokens.
    RankModelIOIInput /MOutput /M
    1Claude Opus 591.7%$5.00$25.00
    2GPT-5.6 Sol86.7%$5.00$30.00
    3Qwen3.8 Max73%$2.00$6.00
    4GPT-5.6 Luna72.9%$0.20$1.20
    5Claude Fable 572.3%$10.00$50.00
    6GPT-5.467.8%$2.50$15.00
    7GPT-5.6 Terra65.3%$2.00$12.00
    8GPT-5.254.8%$1.75$14.00

    Related LLM leaderboards

    LLM LeaderboardCodingMathAgenticReasoningWritingScienceFinanceLong ContextVisionOpen Source

    Individual benchmark pages

    Rank one eval at a time. All LLM benchmarks.

    HLESWE BenchHumanity's Last Exam (No Tools)Humanity's Last Exam (With Tools)Terminal-Bench 2.0Terminal-BenchTerminal-Bench 2.1Terminal-Bench 2Terminal-Bench 3.0ARC-AGI-1 Verified

    IOI FAQ

    Who ranks #1 on the IOI leaderboard?

    As of August 31, 2026, Claude Opus 5 by Anthropic ranks #1 on IOI at 91.7%. API pricing is $5.00/M input and $25.00/M output.

    What are the top models on IOI?

    The current IOI ranking as of August 31, 2026 is 1. Claude Opus 5 at 91.7%; 2. GPT-5.6 Sol at 86.7%; 3. Qwen3.8 Max at 73%.

    Which ioi model is the cheapest?

    Qwen3 235B A22B is the cheapest scored model on this ioi leaderboard at $0.10/M input and $0.10/M output ($0.20 blended). Claude Opus 5 still leads IOI at 91.7%.

    Should I always pick the #1 IOI model?

    Not automatically. Claude Opus 5 leads IOI, but a cheaper scored model can be the better production choice if the quality gap is small. Use the table to weigh IOI against input/output price, context window, and related evals.

    How often is the IOI leaderboard updated?

    Scores and API prices on this page are refreshed from published evals and provider rates. The snapshot is labeled August 31, 2026. Treat it as a current index, not a one-off blog post.

    What is IOI?

    IOI — International Olympiad in Informatics programming contest problems. This page ranks models that have published a IOI score, with live API token prices on the same row.

    Where is the IOI leaderboard?

    This page is the IOI leaderboard. Models are sorted by IOI, with input and output token prices on the same row so you can weigh score against cost. Official boards often omit price; that comparison is the point of this index.

    How is this IOI ranking different from the official board?

    Official eval pages own the methodology. This page keeps the published IOI score next to live API $/M so you can pick a production SKU, not only a trophy number.