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OpenAI: GPT-5.5 Pro vs OpenAI: GPT-5.4 Pro

Head-to-head API cost, context, and performance comparison. Synced at 10:10:17 PM.

Executive Summary

When evaluating OpenAI: GPT-5.5 Pro against OpenAI: GPT-5.4 Pro, the pricing structure is a key differentiator. Both models are remarkably similar in API costs.

However, when looking at raw reasoning capabilities, OpenAI: GPT-5.4 Pro leads with a statistical ELO score of 1508. For tasks involving complex logic, coding, or instruction-following, developers might prefer OpenAI: GPT-5.4 Pro, provided their budget allows for the API burn rate.

Raw Technical comparison

Metric
OpenAI: GPT-5.5 Pro
OpenAI: GPT-5.4 Pro
Performance (ELO)
1508
1508
Input Cost / 1M
$30.00
$30.00
Output Cost / 1M
$180.00
$180.00
Context Window
1,050,000 tokens
1,050,000 tokens

Verdict

If you are looking for pure performance and capability, Tie is statistically superior. However, if API burn rate is the primary concern, Tie wins out aggressively in pricing.

People Also Ask

Is OpenAI: GPT-5.5 Pro cheaper than OpenAI: GPT-5.4 Pro?

No. OpenAI: GPT-5.4 Pro is the more cost-effective model, operating at a lower price point per 1 million tokens.

Which model has the larger context window?

Both models offer an identical context window of 1,050,000 tokens.

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