VerdictPal · editorial desk · updated 16 Oct 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-6 Astra

Model A

Model B

MODEL A

Claude Fable 5.1

Anthropic · Claude Fable

Composite 77Intel 777 rows1 sources

Anthropic's 1 Sep 2026 Mythos-class refresh of Fable 5. Same $10 / $50 per 1M tokens, cache reads $0.25 per 1M. 1M context, 128K output.

MODEL B

GPT-6 Astra

OpenAI · GPT-6

Composite 75Intel 756 rows1 sources

OpenAI's 3 Sep 2026 flagship. API list $10 / $50 per 1M tokens, 1.05M context, 128K output, knowledge cutoff 30 Apr 2026. ChatGPT ships it as GPT-6 Pro on eligible plans.

Claude Fable 5.13stats won

Tied2stats

GPT-6 Astra1stats won

Spec showdown

Capacity, price, freshness.

Claude Fable 5.1vsGPT-6 Astra

Composite scores are within 5 points — 77 for Claude Fable 5.1 vs 75 for GPT-6 Astra. The choice comes down to capability profile and price. Claude Fable 5.1 has the higher benchmark mix (77 vs 75).

Composite score
Claude Fable 5.177Winner on this rowGPT-6 Astra75
Benchmark mix
Claude Fable 5.177Winner on this rowGPT-6 Astra75
Context window
Claude Fable 5.11MGPT-6 Astra1MWinner on this row
Max output
Claude Fable 5.1128KGPT-6 Astra128K
Input price / 1M (lower wins)
Claude Fable 5.1$10GPT-6 Astra$10
Output speed (AA default API)
Claude Fable 5.167 t/sWinner on this rowGPT-6 Astra64 t/s

Composite score

Benchmark mix

Context window

Max output

128K

Input price / 1M (lower wins)

$10

Output speed (AA default API)

67 t/s

64 t/s

Capability grid

What each model can do.

Modalities

Claude Fable 5.1GPT-6 Astra

Text●●

Image●●

Audio——

Video——

Code●●

Tool use●●

Reasoning●●

Access

Claude Fable 5.1GPT-6 Astra

API●●

Consumer app●●

Open weights——

Managed cloud●●

On-device——

Family profile

Top score per benchmark family.

Reasoning

Coding

Agentic

Long context

Benchmark ranks

Every shared benchmark, side by side.

Reasoning

GPQA Diamond#8/184 · #1/184

93.7%

96.1%

Humanity's Last Exam#2/186 · #5/186

59.1%

54.7%

Coding

SciCode#2/97 · #16/97

63.1%

56.5%

Agentic

Terminal-Bench#1/167 · #4/167

91.39%

88.39%

Long context

AA-LCR#3/184 · #32/184

85.33%

80.67%

Performance

AA output speed#91/195 · #97/195

67 t/s

64 t/s

Dossier facts

Dates, sources, fineprint.

Claude Fable 5.1GPT-6 Astra

ProviderAnthropicOpenAI

FamilyClaude FableGPT-6

Release date2026-09-012026-09-03

Knowledge cutoff2026-06-012026-04-30

Context window1M1M

Max output128K128K

Input price /1M$10$10

Output price /1M$50$50

Statussolidflagship

Composite score7775

Intelligence score7775

Intel sourcecompositecomposite

Benchmark rows76

Source count11

Freshnessfreshfresh

Pricing checked2026-09-182026-09-18

Ecosystem

Which tools wrap each model.

Claude Fable 5.1

claude

GPT-6 Astra

chatgpt

Verdict

Which model to actually pick.

Open Claude Fable 5.1's dossier Open GPT-6 Astra's dossier

Questions this comparison answers

Every answer below is assembled from the dated fields on this page. Nothing is written separately for search.

Should you use Claude Fable 5.1 or GPT-6 Astra?

Is Claude Fable 5.1 or GPT-6 Astra cheaper?

Claude Fable 5.1: $10 / $50. GPT-6 Astra: $10 / $50.

How do the Claude Fable 5.1 and GPT-6 Astra context windows compare?

Claude Fable 5.1: 1M. GPT-6 Astra: 1M.