VerdictPal · editorial desk · updated 5 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

GPT-6 Astra vs GPT-5.6 Sol

Model A

Model B

MODEL A

GPT-6 Astra

OpenAI · GPT-6

Composite 60Intel 674 rows2 sources

OpenAI's 3 Sep 2026 flagship. API list $10 / $50 per 1M tokens, 1.05M context, 128K output, knowledge cutoff 30 Apr 2026. Vals Index 66.61% on the live board; AA Intelligence Index v4.2 is 55 at max effort. ChatGPT ships it as GPT-6 Pro on eligible plans.

MODEL B

GPT-5.6 Sol

OpenAI · GPT-5.6

Composite 62Intel 7317 rows5 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OpenAI's July 2026 GPT-5.6 flagship, superseded as the current OpenAI flagship by GPT-6 Astra on 3 Sep 2026.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. Live AA Intelligence Index v4.2 is 51 at max effort.

GPT-6 Astra2stats won

Tied0stats

GPT-5.6 Sol5stats won

Spec showdown

Capacity, price, freshness.

GPT-6 AstravsGPT-5.6 Sol

Composite scores are within 5 points — 60 for GPT-6 Astra vs 62 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 67). GPT-5.6 Sol is more affordable at $4.0/1M input — about 3× cheaper than $10/1M.

Composite score
GPT-6 Astra60GPT-5.6 Sol62Winner on this row
Intelligence (Vals/AA)
GPT-6 Astra67GPT-5.6 Sol73Winner on this row
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 Sol77 t/sWinner on this row
Time to first token (AA default API)
GPT-6 Astra384.30sGPT-5.6 Sol91.64sWinner on this row

Composite score

Intelligence (Vals/AA)

Context window

Max output

128K

—

Input price / 1M (lower wins)

$10

$4.0

Output speed (AA default API)

64 t/s

77 t/s

Time to first token (AA default API)

384.30s

91.64s

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

Agentic

Benchmark ranks

Every shared benchmark, side by side.

Reasoning

Artificial Analysis Intelligence Index#18/187 · #36/187

55%

51%

Agentic

Vals Index#8/23 · #3/23

66.61%

73.1%

Performance

AA output speed#57/187 · #53/187

64 t/s

77 t/s

AA time to first token#1/186 · #4/186

384.30s

91.64s

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 score6062

Intelligence score6773

Intel sourcevalsvals

Benchmark rows417

Source count25

Freshnessfreshfresh

Pricing checked2026-09-052026-09-01

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