GPT-6 Astra Pro API Pricing

OpenAI · context window 1.1M · prices updated 2026-09-15

Input per 1M tokens

$10.00

Output per 1M tokens

$50.00

Cached input per 1M

$1.00

90% cheaper than fresh input

Where GPT-6 Astra Pro sits on price

At $50.00 per million output tokens, GPT-6 Astra Pro is a frontier tier model — 24.0× the median output price of $2.08, which puts it in the most expensive 10% of everything we track. It sits 80th cheapest of the 92 OpenAI models we track. Output costs 5.0× input, the usual spread — trim both, starting with the answer length.

Output tokens per $1

20,000

One full context fill

$10.50

Cheaper than

6% of tracked models

Cached input is 90% cheaper. On an input-heavy workload you need roughly a 28% cache-hit rate to take 25% off the input line — reachable for chatbots and agents that resend the same system prompt and history.

What real workloads cost on GPT-6 Astra Pro

These three workloads are the ones teams actually run on a frontier-priced model — a $50.00/1M model is not bought for the same job as one ten times the price.

Workload	Per request	Per month
Small app — 1K requests/day (500 in / 150 out) The baseline most side projects actually run at.	$0.0125	$375
Coding agent — 300 sessions/day (60K in / 12K out) Multi-step loops re-read the same files; caching matters more than raw price.	$1.20	$10800
Support chatbot — 500 conversations/day (5K in / 1.4K out) Conversation history re-sent each turn — the classic prompt-caching win.	$0.12	$1800

Model your exact traffic in the API cost calculator — it preloads GPT-6 Astra Pro with caching and batch options.

GPT-6 Astra Pro price history

GPT-6 Astra Pro's price has not moved since we began tracking it on Sep 5, 2026 — 10 days of stability in a market where 78 of the 334 models we track have repriced over the same period, including 9 of OpenAI's own 92 models.

Change-points from our daily price snapshots (tracking since Sep 5, 2026; intraday moves between snapshots are not captured).

GPT-6 Astra Pro vs Claude Fable 5.1

The closest-priced alternative from another vendor is Claude Fable 5.1 (Anthropic) — priced within a rounding error on output, with identical input pricing. When two models land this close on price, the decision is quality on your own workload, not the price sheet: run 50 real requests through both and compare.

See Claude Fable 5.1 pricing →

Cheaper alternatives

Claude Opus 4.1 (batch) Anthropic $7.50 in · $37.50 out 25% less per output token GPT-4 Turbo OpenAI $10.00 in · $30.00 out 40% less per output token Kimi K3 (batch) Moonshot (Kimi) $3.00 in · $15.00 out 70% less per output token

More OpenAI models

o1-pro GPT-5.5 Pro GPT-5.4 Pro GPT-4

Frequently asked questions

› How much does the GPT-6 Astra Pro API cost?

GPT-6 Astra Pro costs $10.00 per million input tokens and $50.00 per million output tokens, with cached input at $1.00 per million (90% cheaper). That works out to roughly 20,000 output tokens per dollar.

› What does the small app workload cost on GPT-6 Astra Pro?

Small app — 1K requests/day (500 in / 150 out) costs about $0.0125 per request and $375 per month on GPT-6 Astra Pro. The baseline most side projects actually run at.

› What does it cost to fill GPT-6 Astra Pro's 1.1M context window?

Sending 1.1M of input in a single request costs $10.50 at $10.00 per million tokens — before any output. With prompt caching that same fill drops to about $1.05 on repeat requests. This is why large context windows are cheap to advertise and expensive to actually use.

› Is GPT-6 Astra Pro worth the price?

GPT-6 Astra Pro is priced in the top bracket, at $50.00 per million output tokens. It only pays off where an error is expensive — production code, legal and medical drafting, agents that take real actions. For anything routine, Claude Opus 4.1 (batch) at $37.50 does the same job for a fraction of the bill.