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GPT-5.5 vs GPT-5.4

Token pricing, context window and real monthly cost, side by side. GPT-5.4 is the cheaper of the two for a typical workload — about 2.0× less.

cheaper for a typical workload
GPT-5.4
saves 50% vs GPT-5.5 at 1,500 in / 500 out × 200,000/mo
GPT-5.5 $4,500/mo
GPT-5.4 $2,250/mo
GPT-5.5 versus GPT-5.4 specifications and price.
metric GPT-5.5 GPT-5.4
Input / 1M $5.00 $2.50
Output / 1M $30.00 $15.00
Context 1.1M 1.1M
Cost @ typical workload $4,500/mo $2,250/mo
Modality text + image text + image
Price source list list
Provider OpenAI OpenAI

Snapshot . Cost uses a typical workload; tune it in the calculator. How we measure →

Which should you pick?

On a typical workload, GPT-5.4 costs $2,250/mo against GPT-5.5's $4,500/mo — roughly 2.0× cheaper. But the ranking depends on your output-to-input ratio: output is the pricier direction for both, so an output-heavy job (code generation, long answers) widens the gap while an input-heavy one (summarization, retrieval) narrows it. Both share the same context window, so that's not a deciding factor here.

These are list and routed market prices, not measured outcomes. Two models at the same rate can still cost different amounts to finish the same task, because verbose or reasoning-heavy models emit more tokens. That gap is exactly what measured cost-per-task captures.

Frequently asked questions

Is GPT-5.5 or GPT-5.4 cheaper?

For a typical workload (1,500 input + 500 output tokens × 200,000 requests/month), GPT-5.4 costs $2,250/mo versus $4,500/mo for GPT-5.5 — about 2.0× less. Because output is priced higher than input, the winner can flip if your workload writes much more or less than this; check your own numbers in the calculator.

What's the main difference between GPT-5.5 and GPT-5.4?

On price, GPT-5.5 is $5.00/$30.00 per 1M (in/out) and GPT-5.4 is $2.50/$15.00. Both carry the same context window.

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