VerdictPal · editorial desk · updated 1 Sep 2026VerdictPal

Compare · Two models, head-to-head

Pick two models. See the diff.

Composite scores, benchmark ranks, capability grids, and pricing per million tokens. All sourced from the same data that powers the model atlas.

Tools Models

Claude Fable 5.1 vs GPT-5.6 Sol

Model A

Model B

MODEL A

Claude Fable 5.1

Anthropic · Claude Fable

Composite 67Intel 683 rows2 sources

Anthropic's 1 Sep 2026 Mythos-class refresh of Fable 5. Same $10 / $50 per 1M tokens, cache reads cut to $0.25 per 1M. 1M context, 128K output, always-on adaptive thinking. Vals Index 67.87% on the 1 Sep 2026 snapshot — ahead of Opus 5 and Fable 5. AA Intelligence Index not in the 1 Sep API snapshot yet.

MODEL B

GPT-5.6 Sol

OpenAI · GPT-5.6

Composite 63Intel 7317 rows5 sources

OpenAI's generally available GPT-5.6 flagship for coding, science, cybersecurity, computer use, and long-horizon agentic work. Promotional API list $4 / $20 per 1M tokens (short context) through 21 Nov 2026.

Claude Fable 5.14stats won

Tied0stats

GPT-5.6 Sol3stats won

Spec showdown

Capacity, price, freshness.

Claude Fable 5.1vsGPT-5.6 Sol

Composite scores are within 5 points — 67 for Claude Fable 5.1 vs 63 for GPT-5.6 Sol. The choice comes down to capability profile and price. GPT-5.6 Sol has the higher Vals/AA intelligence score (73 vs 68). GPT-5.6 Sol is more affordable at $4.0/1M input — about 3× cheaper than $10/1M. Claude Fable 5.1's 1M context window dwarfs GPT-5.6 Sol's 0 — a meaningful difference for long-document or codebase work.

Composite score
Claude Fable 5.167Winner on this rowGPT-5.6 Sol63
Intelligence (Vals/AA)
Claude Fable 5.168GPT-5.6 Sol73Winner on this row
Context window
Claude Fable 5.11MWinner on this rowGPT-5.6 SolUnlisted
Max output
Claude Fable 5.1128KWinner on this rowGPT-5.6 Sol—
Input price / 1M (lower wins)
Claude Fable 5.1$10GPT-5.6 Sol$4.0Winner on this row
Output speed (AA default API)
Claude Fable 5.1—GPT-5.6 Sol77 t/sWinner on this row
Time to first token (AA default API)
Claude Fable 5.1—Winner on this rowGPT-5.6 Sol91.64s

Composite score

Intelligence (Vals/AA)

Context window

Unlisted

Max output

128K

—

Input price / 1M (lower wins)

$10

$4.0

Output speed (AA default API)

—

77 t/s

Time to first token (AA default API)

—

91.64s

Capability grid

What each model can do.

Modalities

Claude Fable 5.1GPT-5.6 Sol

Text●●

Image●●

Audio——

Video——

Code●●

Tool use●●

Reasoning●●

Access

Claude Fable 5.1GPT-5.6 Sol

API●●

Consumer app●●

Open weights——

Managed cloud●●

On-device——

Family profile

Top score per benchmark family.

Knowledge

Reasoning

Agentic

Benchmark ranks

Every shared benchmark, side by side.

Knowledge

AA-Omniscience#1/12 · #4/12

67%

59.4%

Reasoning

Artificial Analysis Intelligence Index#1/184 · #6/184

66%

60.9%

Agentic

Vals Index#6/22 · #3/22

67.87%

73.1%

Dossier facts

Dates, sources, fineprint.

Claude Fable 5.1GPT-5.6 Sol

ProviderAnthropicOpenAI

FamilyClaude FableGPT-5.6

Release date2026-09-012026-07-09

Knowledge cutoff2026-06-01unpublished

Context window1MUnlisted

Max output128K—

Input price /1M$10$4.0

Output price /1M$50$20

Statussolidflagship

Composite score6763

Intelligence score6873

Intel sourcevalsvals

Benchmark rows317

Source count25

Freshnessfreshfresh

Pricing checked2026-09-012026-09-01

Ecosystem

Which tools wrap each model.

Claude Fable 5.1

claude

GPT-5.6 Sol

Not listed in any tool yet.

Verdict

Which model to actually pick.

Open Claude Fable 5.1's dossier Open GPT-5.6 Sol's dossier