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AI model history

What was the top AI model in ?

Claude Opus 5.5 from Anthropic, scoring 57.6 on the Intelligence Index at $8 per million tokens. It had been on top for 8 days.

Top Intelligence Index score on each day. Click anywhere to go there.

Leaderboard

The top 10 on September 30, 2026

Ranked by the Artificial Analysis Intelligence Index, with each model's price on that day (per million tokens, 3 parts input to 1 part output).

  1. 1
    Claude Opus 5.5Closed
    Anthropic · released Sep 22, 2026 · 8 days old
    Intelligence 57.6
    $8 /M
  2. 2
    Claude Sonnet 5.5Closed
    Anthropic · released Sep 28, 2026 · 2 days old
    Intelligence 56
    $4 /M
  3. 3
    Claude Fable 5.1Closed
    Anthropic · released Sep 1, 2026 · 4 weeks old
    Intelligence 53.4
    $20 /M
  4. 4
    GPT-6 AstraClosed
    OpenAI · released Sep 3, 2026 · 4 weeks old
    Intelligence 52.7
    $20 /M
  5. 5
    Gemini 4 ArgonClosed
    Google · released Sep 30, 2026 · out that day
    Intelligence 52.6
    $4 /M
  6. 6
    GPT-6.1 SolClosed
    OpenAI · released Sep 29, 2026 · 1 day old
    Intelligence 51.8
    $4 /M
  7. 7
    Claude Opus 5Closed
    Anthropic · released Jul 24, 2026 · 2 months old
    Intelligence 50.8
    $10 /M
  8. 8
    Claude Fable 5Closed
    Anthropic · released Jun 9, 2026 · 4 months old
    Intelligence 49.6
    $20 /M
  9. 9
    Muse Spark 1.3Closed
    Meta · released Sep 2, 2026 · 4 weeks old
    Intelligence 48.1
    $2 /M
  10. 10
    GPT-6 SolClosed
    OpenAI · released Sep 22, 2026 · 8 days old
    Intelligence 47.6
    $4 /M

3 weeks later

What has happened since

#1Still the top model

9 models have come out since and none has beaten Claude Opus 5.5's 57.6.

Not yetUnder $1 per million

No model under $1 per million tokens has matched Claude Opus 5.5's score so far.

Not yetOpen weights

No open-weights model has matched Claude Opus 5.5's score so far.

The race

Which lab held the top spot

OpenAI led for 2.5 years of the 4 years since ChatGPT launched. Anthropic has held #1 since Apr 16, 2026, 6 models in a row. We rank by the Artificial Analysis Intelligence Index. Other leaderboards, such as LMArena's human votes, crown different models.

  • OpenAI65%2.5 years at #1 across 12 models. Longest: GPT-4, 8 months.
  • Anthropic33%15 months at #1 across 11 models. Longest: Claude 3 Opus, 6 months.
  • xAI2%4 weeks at #1 across 1 model. Longest: Grok 4, 4 weeks.
  • Google<1%6 days at #1 across 1 model. Longest: Gemini 3 Pro Preview, 6 days.

The wider field

491 models were out on Sep 30, 2026

Best open model
MiMo-V2.6-Pro

Xiaomi, scoring 46.3. #13 overall, 11.3 points behind.

Best under $1 per million
MiMo-V2.6-Pro

Xiaomi, scoring 46.3. #13 overall at $0.54, 15× cheaper than #1.

New in the 30 days before · 26
  • Gemini 4 Argon52.6
  • GPT-6.1 Sol51.8
  • Claude Sonnet 5.556
  • Claude Opus 5.557.6
  • GPT-6 Sol47.6
  • GPT-6 Luna38.1
and 20 more

Browse

The top AI model, month by month

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Try today's top models on your own prompt

Scores tell you who leads on average. Send one prompt to up to six models and see which answer you'd actually use, with what each one cost. For the long view of prices, read Six months later, the best AI costs 20× less.

Compare models

Scores and release dates from Artificial Analysis (Intelligence Index, best published effort of each model), data through October 18, 2026. Prices are list prices on the day, including later cuts we know of. Models without a public price are ranked but not priced.