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What was the top AI model in ?

Claude Fable 5 from Anthropic, scoring 49.6 on the Intelligence Index at $20 per million tokens. It had been on top for 3 weeks.

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

Leaderboard

The top 10 on June 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 Fable 5Closed
    Anthropic · released Jun 9, 2026 · 3 weeks old
    Intelligence 49.6
    $20 /M
  2. 2
    Claude Opus 4.8Closed
    Anthropic · released May 28, 2026 · 5 weeks old
    Intelligence 41.8
    $10 /M
  3. 3
    Claude Opus 4.7Closed
    Anthropic · released Apr 16, 2026 · 2 months old
    Intelligence 40.7
    $10 /M
  4. 4
    GPT-5.4Closed
    OpenAI · released Mar 5, 2026 · 4 months old
    Intelligence 39
    $5.62 /M
  5. 5
    GPT-5.5Closed
    OpenAI · released Apr 23, 2026 · 2 months old
    Intelligence 38.4
    $11 /M
  6. 6
    Claude Sonnet 5Closed
    Anthropic · released Jun 30, 2026 · out that day
    Intelligence 38.2
    $4 /M
  7. 7
    GLM-5.2Open weights
    Z.ai · released Jun 16, 2026 · 2 weeks old
    Intelligence 33.7
    $2.15 /M
  8. 8
    Gemini 3.5 FlashClosed
    Google · released May 19, 2026 · 6 weeks old
    Intelligence 33.6
    $3.38 /M
  9. 9
    GPT-5.3 CodexClosed
    OpenAI · released Feb 5, 2026 · 5 months old
    Intelligence 32.5
    $4.81 /M
  10. 10
    Claude Opus 4.6Closed
    Anthropic · released Feb 5, 2026 · 5 months old
    Intelligence 31.9
    $10 /M

4 months later

What has happened since

#10Where Claude Fable 5 ranks today

80 models have come out since. Today's best is Claude Opus 5.5 at 57.6, 8 points higher.

5×Cheaper for the same score

Claude Sonnet 5.5 scores at least as well today for $4 per million tokens, against $20 for Claude Fable 5 back then.

Not yetUnder $1 per million

No model under $1 per million tokens has matched Claude Fable 5's score so far.

Not yetOpen weights

No open-weights model has matched Claude Fable 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

420 models were out on Jun 30, 2026

Best open model
GLM-5.2

Z.ai, scoring 33.7. #7 overall, 15.9 points behind.

Best under $1 per million
DeepSeek V4 Pro 0424

DeepSeek, scoring 30.4. #13 overall at $0.54, 35× cheaper than #1.

New in the 30 days before · 14
  • Claude Sonnet 538.2
  • LongCat 2.019.1
  • GPT-5.5 Instant (June 2026)26
  • GLM-5.233.7
  • Grok Build 0.1 061627.2
  • Kimi K2.7 Code25.8
and 8 more

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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.