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

GPT-6 Astra vs GPT-5.6 Sol

Model A

Model B

MODEL A

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.

MODEL B

GPT-5.6 Sol

OpenAI · GPT-5.6

Composite 64Intel 6411 rows3 sources

OpenAI's July 2026 GPT-5.6 flagship, superseded as the current OpenAI flagship by GPT-6 Astra on 3 Sep 2026. Promo API list still $4 / $20 per 1M tokens (short context) through 21 Nov 2026.

GPT-6 Astra4stats won

Tied0stats

GPT-5.6 Sol2stats won

Spec showdown

Capacity, price, freshness.

GPT-6 AstravsGPT-5.6 Sol

GPT-6 Astra dominates on composite score (75 vs 64), driven by broader benchmark coverage and stronger per-family performance. GPT-6 Astra has the higher benchmark mix (75 vs 64). GPT-5.6 Sol is more affordable at $4.0/1M input — about 3× cheaper than $10/1M.

Composite score
GPT-6 Astra75Winner on this rowGPT-5.6 Sol64
Benchmark mix
GPT-6 Astra75Winner on this rowGPT-5.6 Sol64
Context window
GPT-6 Astra1MWinner on this rowGPT-5.6 Sol1M
Max output
GPT-6 Astra128KWinner on this rowGPT-5.6 Sol—
Input price / 1M (lower wins)
GPT-6 Astra$10GPT-5.6 Sol$4.0Winner on this row
Output speed (AA default API)
GPT-6 Astra64 t/sGPT-5.6 Sol85 t/sWinner on this row

Composite score

Benchmark mix

Context window

Max output

128K

—

Input price / 1M (lower wins)

$10

$4.0

Output speed (AA default API)

64 t/s

85 t/s

Capability grid

What each model can do.

Modalities

GPT-6 AstraGPT-5.6 Sol

Text●●

Image●●

Audio——

Video——

Code●●

Tool use●●

Reasoning●●

Access

GPT-6 AstraGPT-5.6 Sol

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#1/184 · #7/184

96.1%

94.1%

Humanity's Last Exam#5/186 · #9/186

54.7%

49.5%

Coding

SciCode#16/97 · #14/97

56.5%

57.1%

Agentic

Terminal-Bench#4/167 · #7/167

88.39%

88.01%

Long context

AA-LCR#32/184 · #7/184

80.67%

84%

Performance

AA output speed#97/195 · #73/195

64 t/s

85 t/s

Dossier facts

Dates, sources, fineprint.

GPT-6 AstraGPT-5.6 Sol

ProviderOpenAIOpenAI

FamilyGPT-6GPT-5.6

Release date2026-09-032026-07-09

Knowledge cutoff2026-04-30unpublished

Context window1M1M

Max output128K—

Input price /1M$10$4.0

Output price /1M$50$20

Statusflagshipflagship

Composite score7564

Intelligence score7564

Intel sourcecompositecomposite

Benchmark rows611

Source count13

Freshnessfreshfresh

Pricing checked2026-09-182026-09-01

Ecosystem

Which tools wrap each model.

GPT-6 Astra

chatgpt

GPT-5.6 Sol

Not listed in any tool yet.

Verdict

Which model to actually pick.

Open GPT-6 Astra's dossier Open GPT-5.6 Sol'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 GPT-6 Astra or GPT-5.6 Sol?

Is GPT-6 Astra or GPT-5.6 Sol cheaper?

GPT-6 Astra: $10 / $50. GPT-5.6 Sol: $4.0 / $20.

How do the GPT-6 Astra and GPT-5.6 Sol context windows compare?

GPT-6 Astra: 1M. GPT-5.6 Sol: 1M.