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AI model history

What was the top AI model on ?

GPT-5 Codex from OpenAI, scoring 24.9 on the Intelligence Index at $3.44 per million tokens. It came out that very day.

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

Leaderboard

The top 10 on September 23, 2025

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
    GPT-5 CodexClosed
    OpenAI · released Sep 23, 2025 · out that day
    Intelligence 24.9
    $3.44 /M
  2. 2
    GPT-5Closed
    OpenAI · released Aug 7, 2025 · 7 weeks old
    Intelligence 23
    $3.44 /M
  3. 3
    Claude 4.1 OpusClosed
    Anthropic · released Aug 5, 2025 · 7 weeks old
    Intelligence 22.8
    $30 /M
  4. 4
    Grok 4Closed
    xAI · released Jul 10, 2025 · 2 months old
    Intelligence 22.5
    $6 /M
  5. 5
    o3-proClosed
    OpenAI · released Jun 10, 2025 · 3 months old
    Intelligence 21.9
    $35 /M
  6. 6
    Claude 4 OpusClosed
    Anthropic · released May 22, 2025 · 4 months old
    Intelligence 20.6
    $30 /M
  7. 7
    GPT-5 miniClosed
    OpenAI · released Aug 7, 2025 · 7 weeks old
    Intelligence 20.6
    $0.69 /M
  8. 8
    o3Closed
    OpenAI · released Apr 16, 2025 · 5 months old
    Intelligence 20.2
    $3.50 /M
  9. 9
    Claude 4 SonnetClosed
    Anthropic · released May 22, 2025 · 4 months old
    Intelligence 18.9
    $6 /M
  10. 10
    Grok 4 FastClosed
    xAI · released Sep 19, 2025 · 4 days old
    Intelligence 17.9
    $0.28 /M

13 months later

What has happened since

#94Where GPT-5 Codex ranks today

260 models have come out since. Today's best is Claude Opus 5.5 at 57.6, 32.7 points higher.

25×Cheaper for the same score

Agnes 2.5 Pro Beta scores at least as well today for $0.15 per million tokens, against $3.44 for GPT-5 Codex back then.

8 monthsUntil it cost under $1

DeepSeek V4 Pro 0424 matched it for $0.54 per million tokens on May 22, 2026.

5 monthsUntil open weights caught up

GLM-5 from Z.ai matched it on Feb 11, 2026, free to download and run.

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

240 models were out on Sep 23, 2025

Best open model
Kimi K2 0905

Kimi, scoring 15.3. #15 overall, 9.6 points behind.

Best under $1 per million
GPT-5 mini

OpenAI, scoring 20.6. #7 overall at $0.69, 5× cheaper than #1.

New in the 30 days before · 25
  • GPT-5 Codex24.9
  • Qwen3 Max15.6
  • Qwen3 VL 235B A22B13.4
  • Qwen3 VL 235B A22B Instruct9.9
  • LFM2 2.6B5.2
  • DeepSeek V3.1 Terminus14.8
and 19 more

Browse

The top AI model, month by month

2026
2025
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2023
2022

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.