head-to-head

OpenAI: GPT-6.1 Terra Pro vs Anthropic: Claude Sonnet 5.5 (batch)

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-02.

	OpenAI: GPT-6.1 Terra Pro	Anthropic: Claude Sonnet 5.5 (batch)
Vendor	openai	anthropic
Quality Score	100	100
Input Price	$1.00/M	$1.00/M
Output Price	$5.00/M	$5.00/M
Context Window	1,050,000	1,000,000
Max Output	128,000	128,000
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	✓
Audio	-	-

The verdict

For a sample job of 1 million input tokens and 250,000 output tokens, both cost $2.25 at current list prices.

Both take in a similar amount of text: 1,050,000 and 1,000,000 tokens, about 1,575 and 1,500 pages.

GPT-6.1 Terra Pro was released in October 2026 and Claude Sonnet 5.5 (batch) in September 2026.

Costs use current list prices per million tokens; page counts assume about 0.75 words per token and 500 words per page.