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Anthropic: Claude Sonnet 5.5 vs OpenAI: GPT-5.4 Pro

Head-to-head API cost, context, and performance comparison. Synced at 2:07:09 PM.

Executive Summary

When evaluating Anthropic: Claude Sonnet 5.5 against OpenAI: GPT-5.4 Pro, the pricing structure is a key differentiator. Anthropic: Claude Sonnet 5.5 is approximately 94% more cost-effective per 1 million tokens overall.

However, when looking at raw reasoning capabilities, Anthropic: Claude Sonnet 5.5 leads with a statistical ELO score of 1603. For tasks involving complex logic, coding, or instruction-following, developers might prefer Anthropic: Claude Sonnet 5.5, provided their budget allows for the API burn rate.

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Raw Technical comparison

Metric
Anthropic: Claude Sonnet 5.5
OpenAI: GPT-5.4 Pro
Performance (ELO)
1603
1508
Input Cost / 1M
$2.00
$30.00
Output Cost / 1M
$10.00
$180.00
Context Window
1,000,000 tokens
1,050,000 tokens

Verdict

If you are looking for pure performance and capability, Anthropic: Claude Sonnet 5.5 is statistically superior. However, if API burn rate is the primary concern, Anthropic: Claude Sonnet 5.5 wins out aggressively in pricing.

People Also Ask

Is Anthropic: Claude Sonnet 5.5 cheaper than OpenAI: GPT-5.4 Pro?

Yes. Anthropic: Claude Sonnet 5.5 is cheaper for both input and output generation compared to OpenAI: GPT-5.4 Pro. Exploring alternatives often yields cost reductions.

Which model has the larger context window?

The OpenAI: GPT-5.4 Pro model has the advantage in memory, offering a massive 1,050,000 token limit for document ingestion.

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