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AI model history

What was the top AI model in ?

GPT-3.5 Turbo from OpenAI, scoring 5.5 on the Intelligence Index at $0.75 per million tokens. It had been on top for 3 months.

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

Leaderboard

The top 2 on February 28, 2023

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). The index uses today's harder tests, so models from before late 2024 all score between 5 and 9 and their order is rough.

  1. 1
    GPT-3.5 TurboClosed
    OpenAI · released Nov 30, 2022 · 3 months old
    Intelligence 5.5
    $0.75 /M
  2. 2
    Llama 65BOpen weights
    Meta · released Feb 24, 2023 · 4 days old
    Intelligence 5
    No public price

3.5 years later

What has happened since

#436Where GPT-3.5 Turbo ranks today

498 models have come out since. Today's best is Claude Opus 5.5 at 57.6, 52.1 points higher.

20×Cheaper for the same score

Gemma 4 E4B scores at least as well today for $0.04 per million tokens, against $0.75 for GPT-3.5 Turbo back then.

Day oneUnder $1 per million

GPT-3.5 Turbo already cost $0.75 per million tokens.

5 monthsUntil open weights caught up

Llama 2 Chat 7B from Meta matched it on Jul 18, 2023, 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

2 models were out on Feb 28, 2023

Best open model
Llama 65B

Meta, scoring 5. #2 overall, 0.5 points behind.

New in the 30 days before · 1
  • Llama 65B5

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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.

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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.