API price comparison · Updated November 2, 2026

GPT-6 Astra vs Gemini 4 Argon pricing

Quick answer

GPT-6 Astra costs $10.00 per million input tokens and $50.00 per million output tokens; Gemini 4 Argon costs $2.00 and $10.00. For an agent task (80,000 input tokens, 60,000 of them cached, and 6,000 output), GPT-6 Astra costs $0.560 and Gemini 4 Argon $0.106: GPT-6 Astra costs 5.3× as much. Gemini 4 Argon's price changes on Dec 1, 2026 to $4.00 input and $20.00 output per million tokens.

Compare your monthly cost on GPT-6 Astra and Gemini 4 Argon

Requests per monthInput tokens per requestOutput tokens per requestShare of input from cache (%) Use the Batch API where offered

Estimated monthly cost

GPT-6 Astra$5,500$0.055 per request

Gemini 4 Argon$1,100$0.011 per request

Gemini 4 Argon costs 80% less for this workload. Excludes cache writes, tools and taxes.

GPT-6 Astra vs Gemini 4 Argon prices per million tokens

Price	GPT-6 Astra	Gemini 4 Argon
Model ID	`gpt-6-astra`	`gemini-4-argon`
Input	$10.00	$2.00
Cache read	$1.00	$0.10
Cache write	$12.50	Storage billed per hour
Output	$50.00	$10.00
Batch in / out	$5.00 / $25.00	$1.00 / $5.00
Long prompts	Over 272,000: $20.00 / $75.00	Same rate
Scheduled change	None announced	From Dec 1, 2026: $4.00 / $20.00
Status	Available	Paid tier only

Prices for each provider’s own API, from OpenAI’s pricing page and Google Gemini’s pricing page. The lower price in each row is highlighted. Ganivra uses these same rates to price GPT-6 Astra and Gemini 4 Argon calls.

What one request costs on GPT-6 Astra and Gemini 4 Argon

Worked out from the prices above at standard rates, with no Batch discount. Long-prompt rates apply where a model has them.

Request	GPT-6 Astra	Gemini 4 Argon	Per 1,000 requests	Difference
Chat reply3,000 input tokens, 500 output	$0.055	$0.011	$55.00 / $11.00	GPT-6 Astra costs 5× as much
Document summary30,000 input tokens, 1,500 output	$0.375	$0.075	$375 / $75.00	GPT-6 Astra costs 5× as much
Agent task80,000 input tokens (60,000 cached), 6,000 output	$0.560	$0.106	$560 / $106	GPT-6 Astra costs 5.3× as much
Long document300,000 input tokens, 2,000 output	$6.15	$0.620	$6,150 / $620	GPT-6 Astra costs 9.9× as much

What changes which one costs less

Prompt caching: Cache reads cost $1.00 per million, 10% of the input price on GPT-6 Astra, and $0.10 per million, 5% of the input price on Gemini 4 Argon. The more of each prompt you reuse, the more this decides the bill.
Cache writes: GPT-6 Astra charges $12.50 per million tokens written to cache. Gemini 4 Argon charges no write fee; Gemini bills cache storage per million tokens per hour.
Long prompts: On GPT-6 Astra, prompts over 272,000 tokens cost $20.00 input and $75.00 output for the whole request. On Gemini 4 Argon, one rate at any prompt length. A 300 prompt costs $6.15 on GPT-6 Astra and $0.620 on Gemini 4 Argon.
Batch API: GPT-6 Astra costs 50% less through the Batch API: $5.00 input and $25.00 output. Gemini 4 Argon costs 50% less through the Batch API: $1.00 input and $5.00 output.
Price change on Dec 1, 2026: Gemini 4 Argon goes from $2.00 input and $10.00 output to $4.00 input and $20.00 output per million tokens. Calls before then keep the old price; the agent task goes from $0.106 to $0.212.
Gemini 4 Argon availability: Paid tier only.
Token counts: OpenAI and Google Gemini use different tokenizers, so the same text becomes a different number of tokens. The model with the lower per-token price can still cost more per request; compare on your own prompts before switching.

Compare them on your own customers, not a sample request.

Ganivra prices every GPT-6 Astra and Gemini 4 Argon call you make and adds it up by customer, feature and workflow, next to what each customer pays. Switch a workflow and see what it did to each customer’s margin.

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GPT-6 Astra vs Gemini 4 Argon pricing questions

Is GPT-6 Astra cheaper than Gemini 4 Argon?

Per million tokens, GPT-6 Astra costs $10.00 input and $50.00 output, and Gemini 4 Argon $2.00 input and $10.00 output. For an agent task (80,000 input tokens, 60,000 of them cached, and 6,000 output), GPT-6 Astra costs 5.3× as much: $560 against $106 per 1,000 tasks.

How much does GPT-6 Astra cost per million tokens?

$10.00 input and $50.00 output per million tokens on OpenAI's API, with cached input at $1.00 and Batch at $5.00 input and $25.00 output. Prompts over 272,000 tokens cost $20.00 input and $75.00 output.

How much does Gemini 4 Argon cost per million tokens?

$2.00 input and $10.00 output per million tokens on Google Gemini's API, with cached input at $0.10 and Batch at $1.00 input and $5.00 output. The rate is the same at any prompt length.

Which is cheaper for long prompts, GPT-6 Astra or Gemini 4 Argon?

For a 300,000 input tokens, 2,000 output request, GPT-6 Astra costs $6.15 and Gemini 4 Argon $0.620: GPT-6 Astra costs 9.9× as much. On GPT-6 Astra, prompts over 272,000 tokens cost $20.00 input and $75.00 output for the whole request; on Gemini 4 Argon, one rate at any prompt length.

Is Gemini 4 Argon getting more expensive?

Yes. On Dec 1, 2026, Gemini 4 Argon goes from $2.00 input and $10.00 output to $4.00 input and $20.00 output per million tokens. After the change, the agent task costs $0.212 on Gemini 4 Argon against $0.560 on GPT-6 Astra.

How do I compare GPT-6 Astra and Gemini 4 Argon on my own traffic?

Record what each call actually used, then price the same usage on both models. Ganivra does this from your recorded calls: it shows what each customer, feature and workflow would cost on GPT-6 Astra and on Gemini 4 Argon, next to what each customer pays you.

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