Is GPT-6 Astra or Claude Opus 5.5 cheaper?

Claude Opus 5.5 is cheaper for a typical request of 1,000 input and 500 output tokens: $0.014 versus $0.035 for GPT-6 Astra, about 60% less.

What are the per-token prices of GPT-6 Astra and Claude Opus 5.5?

GPT-6 Astra costs $10.00 input and $50.00 output per million tokens. Claude Opus 5.5 costs $4.00 input and $20.00 output per million tokens.

Which has the larger context window, GPT-6 Astra or Claude Opus 5.5?

GPT-6 Astra has the larger context window: 1.05M tokens versus 1M for Claude Opus 5.5.

OpenAI vs Anthropic

GPT-6 Astra vs Claude Opus 5.5: pricing comparison

Claude Opus 5.5 costs 2.5× less than GPT-6 Astra for a typical 1,000-input, 500-output request. Here is how the two compare on price, context and discounts.

Prices last updated: September 25, 2026

	GPT-6 Astra	Claude Opus 5.5
Provider	OpenAI	Anthropic
Input per 1M tokens	$10.00	$4.00
Output per 1M tokens	$50.00	$20.00
Context window	1.05M	1M
Batch discount	50% off	50% off
Typical request (1,000 in / 500 out)	$0.035	$0.014
Monthly at 1,000 requests/day	$1,050.00	$420.00

GPT-6 Astra: OpenAI's flagship model, released September 2026.

Claude Opus 5.5: Successor to Claude Opus 5 at a lower per-token price.

Compare with your own numbers

Input tokens

Output tokens

Requests / day

GPT-6 Astra per request: $0.035
Per month: $1,050.00

Claude Opus 5.5 per request: $0.014
Per month: $420.00

Cost by task

Cost per 1,000 requests at standard prices.
Task	Tokens (in / out)	GPT-6 Astra	Claude Opus 5.5
Short chat reply	500 / 300	$20.00	$8.00
RAG answer	6,000 / 600	$90.00	$36.00
Summarize a long document	12,000 / 1,000	$170.00	$68.00
Output-heavy generation	1,000 / 4,000	$210.00	$84.00

Output tokens usually dominate the bill — see input vs output token cost.

Frequently asked questions

Is GPT-6 Astra or Claude Opus 5.5 cheaper?: Claude Opus 5.5 is cheaper for a typical request of 1,000 input and 500 output tokens: $0.014 versus $0.035 for GPT-6 Astra, about 60% less.
What are the per-token prices of GPT-6 Astra and Claude Opus 5.5?: GPT-6 Astra costs $10.00 input and $50.00 output per million tokens. Claude Opus 5.5 costs $4.00 input and $20.00 output per million tokens.
Which has the larger context window, GPT-6 Astra or Claude Opus 5.5?: GPT-6 Astra has the larger context window: 1.05M tokens versus 1M for Claude Opus 5.5.

More comparisons

All comparisons →