Quick answers

AIGrow provides AI visibility monitoring, a business assistant, blog publishing and scoped automation services. Start with the free scan to inspect the output before paying.

Run the free scan

The scan is free and monitoring plans start at $29 a month. The operations audit is $290, the visibility audit is $490, and custom builds receive a written price before work starts.

See the plans

Run the free scan. It reads your site, asks several AI assistants what your customers ask, and points you at one thing. No signup required, and it will tell you if you do not need us.

Start now

Yes. Use the contact form for product, billing, support or project questions. Describe the goal and the system involved so the first reply can be specific.

Contact AIGrow
Head to head · prices checked 22 September 2026

GPT-6 Astra vs Gemini 3.1 Pro (preview)

OpenAI's newest flagship against Google's strongest model at a fifth of the input price. Both list prices from the makers’ own pages, and what three everyday jobs cost on each.

What a job costsEvery model

US dollars, standard rate, shortest context band. Price only: this page does not rank quality.

1,000 support replies
4.6×what GPT-6 Astra costs next to Gemini 3.1 Pro (preview)
GPT-6 Astra
$50.00
Gemini 3.1 Pro (preview)
$10.80
GPT-6 Astra, per M tokens
$10 / $50
Gemini 3.1 Pro (preview), per M tokens
$2 / $12

3,000 tokens in and 400 out each, at list price.

Per million tokens, GPT-6 Astra costs $10 in and $50 out; Gemini 3.1 Pro (preview) costs $2 in and $12 out. 1,000 support replies cost $50.00 on GPT-6 Astra and $10.80 on Gemini 3.1 Pro (preview), so GPT-6 Astra costs 4.6 times as much. Both read up to 1.05M tokens at once.

Side by side

Each maker’s published rate for its standard tier. Cached input is what a repeated prompt prefix costs once the provider has stored it.

GPT-6 Astra and Gemini 3.1 Pro (preview): list prices and specifications
FactGPT-6 AstraGemini 3.1 Pro (preview)
MakerOpenAIGoogle
TierFlagshipsFlagships
Input, per M tokens$10.00$2.00
Output, per M tokens$50.00$12.00
Cached input$1.00$0.20
Context window1.05M1.05M
Released3 Sep 202619 Feb 2026
WeightsClosedClosed

What a job costs on each

1,000 runs of each job at the two list prices. The gap moves from job to job because the models price input, output and cached context differently.

Cost of 1,000 runs of three jobs on GPT-6 Astra and Gemini 3.1 Pro (preview)
JobGPT-6 AstraGemini 3.1 Pro (preview)Cheaper
Support reply3,000 in, 400 out.$50.00$10.80Gemini 3.1 Pro (preview), 78% less
Document summary25,000 in, 1,000 out.$300$62.00Gemini 3.1 Pro (preview), 79% less
Agent task80,000 in (70,000 cached), 3,000 out.$320$70.00Gemini 3.1 Pro (preview), 78% less

The token counts are ours, chosen to look like real work; the prices are the makers’. A model with no published cache price bills the agent task’s repeated context at its full input rate.

The small print

What each base rate leaves out, from the makers’ own pages: surcharges, discounts, promotions and cache pricing.

GPT-6 Astra
Requests above 272K input tokens bill 2x input and 1.5x output ($20 / $75, cached $2). Cache write $12.50. Batch and Flex 50% off, Fast mode 2x. Data residency adds 10%. Context 1,050,000 with max input 922K. OpenAI’s pricing page
Gemini 3.1 Pro (preview)
Preview model, but Google has no GA 3.x Pro and it is widely used. Prompts above 200K tokens: $4 / $18, cached $0.40. Cache storage $4.50 per MTok per hour. Batch 50% off. Max output 65,536. Google’s pricing page

Other comparisons

Every head to head on the list that involves GPT-6 Astra or Gemini 3.1 Pro (preview).

Run GPT-6 Astra for a quarter of list price

AIGROW API credit covers GPT-6 Astra and is metered at the list prices above: $25 buys $100 of usage.

See API creditCompare every model

Prices checked 22 September 2026