GPT-5.6 Terra vs o3

o3 leads in 3 of 8 categories

Arena ELO

o3

Cheaper

Tie

Faster

o3

Detailed Comparison

Category	GPT-5.6 Terra	o3
Provider	OpenAI	OpenAI
Context Window	128K	200K WIN
Input Price ($/1M)	$10	$10
Output Price ($/1M)	$30 WIN	$40
Arena ELO	N/A	1350 WIN
Coding	N/A	unknown
Reasoning	N/A	unknown
Speed (tokens/sec)	N/A	~30 t/s WIN
Open Source	No	No

Frequently Asked Questions

Which is cheaper, GPT-5.6 Terra or o3?

GPT-5.6 Terra is approximately 20% cheaper than o3 per million tokens.

Which is better for coding, GPT-5.6 Terra or o3?

GPT-5.6 Terra scores N/A on coding benchmarks, while o3 scores unknown.

Which has a larger context window?

GPT-5.6 Terra supports 128K context, while o3 supports 200K.

Is GPT-5.6 Terra or o3 open source?

GPT-5.6 Terra is proprietary. o3 is proprietary.

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