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GPT-6 Sol vs Claude Fable 5

Of the 3 public leaderboards that rate both, GPT-6 Sol scores higher on 1 and Claude Fable 5 on 2. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GPT-6 Sol is at 75.5 and Claude Fable 5 at 69.9 (out of 100). On each maker's API, GPT-6 Sol costs $2 / $10 per 1M tokens (input / output) and Claude Fable 5 $10 / $50.

Scores as published by each board; table composed November 10, 2026.

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Leaderboard by leaderboard

BoardGPT-6 SolClaude Fable 5Higher
LMArena
Elo (community votes)
1,673.91,625.2GPT-6 Sol
SimpleBench
AVG@5 % (private set)
73.181.9Claude Fable 5
Epoch AI
Epoch Capabilities Index (ECI) · many benchmarks on one scale
164164.3Claude Fable 5

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

For coding

On the ArtificialWatch coding index, GPT-6 Sol is at 41.2 (#25 of 47) and Claude Fable 5 at 88.8 (#4). Claude Fable 5 scores higher on both coding boards that rate them.

Coding boardGPT-6 SolClaude Fable 5
LMArena · Coding1,4481,518.6
Vals Vibe Code Bench87.890.4

The full AI coding leaderboard →

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 · $2/$10 per 1M, cached input $0.20 — from our own read of OpenAI's GPT-6.1 Sol launch page, which calls 6.1 Sol's $2/$10 'the same sticker as GPT-6 Sol' and its $0.10 cached rate half of GPT-6 Sol's · models.dev lists gpt-6-sol on OpenAI's own API (read Sep 24).

Vals publishes CyberOffense: gated GPT-6 Sol completes 80.8% of a simulated network attack, open-weight DeepSeek V4.1 Flash 72.8%

2026-11-09 · Vals AI has published its CyberOffense benchmark in full. Seven AI models ran as autonomous agents against two simulated corporate networks, with no human help. GPT-6 Sol, which OpenAI offers for this kind of work only through its restricted Daybreak program, completed the most: 80.8% of objectives on Vals' scoring.

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 3 public leaderboards that rate both, GPT-6 Sol scores higher on 1 and Claude Fable 5 on 2. 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 75.5 and Claude Fable 5 at 69.9 (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 2026-11-10.

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.

How do GPT-6 Sol and Claude Fable 5 compare for coding?

On the ArtificialWatch coding index, GPT-6 Sol is at 41.2 (#25 of 47) and Claude Fable 5 at 88.8 (#4). Claude Fable 5 scores higher on both coding boards that rate them.

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 November 10, 2026). Boards measure different things, so raw scores are only comparable within a row.

More comparisons

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