artificialwatch

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GPT-6 Sol vs Claude Fable 5

Of the 5 public leaderboards that rate both, GPT-6 Sol scores higher on 1 and Claude Fable 5 on 4. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GPT-6 Sol is at 75.9 and Claude Fable 5 at 85.1 (out of 100).

Scores as published by each board; table composed September 25, 2026.

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Leaderboard by leaderboard

BoardGPT-6 SolClaude Fable 5Higher
LMArena
Elo (community votes)
1,685.91,626.8GPT-6 Sol
LiveBench
global average (0-100)
79.283Claude Fable 5
SimpleBench
AVG@5 % (private set)
73.181.9Claude Fable 5
Vals AI
Vals Index accuracy % · weighted finance + coding tasks
62.666Claude Fable 5
Artificial Analysis
intelligence index · measured runs only
47.549.6Claude Fable 5

Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.

GPT-6 Sol at a glance

Developer
OpenAI
Status
Live since September 22, 2026
API price
$2 input / $10 output per 1M tokens · OpenAI, gpt-6-sol
Context window
1.05M tokens

Live — Sep 22, in the API, ChatGPT and Codex the same day · the everyday tier under Astra · models.dev lists gpt-6-sol on OpenAI's own API (read Sep 24).

Full GPT-6 Sol tracker →

Claude Fable 5 at a glance

Developer
Anthropic
Status
Live since July 1, 2026
API price
$10 input / $50 output per 1M tokens · Anthropic, claude-fable-5
Context window
1M tokens

Returned Jul 1.

Full Claude Fable 5 tracker →

GPT-6 Sol vs Claude Fable 5: quick answers

Which is better, GPT-6 Sol or Claude Fable 5?

It depends on what you measure. Of the 5 public leaderboards that rate both, GPT-6 Sol scores higher on 1 and Claude Fable 5 on 4. GPT-6 Sol's widest lead is on LMArena; Claude Fable 5's widest lead is on SimpleBench. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GPT-6 Sol is at 75.9 and Claude Fable 5 at 85.1 (out of 100).

Which is newer, GPT-6 Sol or Claude Fable 5?

GPT-6 Sol. It went live on September 22, 2026, 83 days after Claude Fable 5 (July 1, 2026).

Which is cheaper, GPT-6 Sol or Claude Fable 5?

GPT-6 Sol is cheaper on both input and output. On each vendor's own API, GPT-6 Sol is $2 input / $10 output per million tokens and Claude Fable 5 is $10 input / $50 output per million tokens. GPT-6 Sol's rate rises for prompts over 272K tokens. Prices as published in the models.dev catalog, as of 2026-09-25.

Which has the bigger context window, GPT-6 Sol or Claude Fable 5?

GPT-6 Sol, at 1.05M tokens against Claude Fable 5's 1M, as each vendor lists it.

Who makes GPT-6 Sol and Claude Fable 5?

GPT-6 Sol is from OpenAI; Claude Fable 5 is from Anthropic.

Where do these numbers come from?

Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed September 25, 2026). Boards measure different things, so raw scores are only comparable within a row.

More comparisons

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