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OpenAI: GPT-5 Nano vs Anthropic: Claude Opus 5.5

Head-to-head API cost, context, and performance comparison. Synced at 1:45:40 PM.

Executive Summary

When evaluating OpenAI: GPT-5 Nano against Anthropic: Claude Opus 5.5, the pricing structure is a key differentiator. OpenAI: GPT-5 Nano is approximately 98% more cost-effective per 1 million tokens overall.

However, when looking at raw reasoning capabilities, Anthropic: Claude Opus 5.5 leads with a statistical ELO score of 1483. For tasks involving complex logic, coding, or instruction-following, developers might prefer Anthropic: Claude Opus 5.5, provided their budget allows for the API burn rate.

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Raw Technical comparison

Metric
OpenAI: GPT-5 Nano
Anthropic: Claude Opus 5.5
Performance (ELO)
1483
1483
Input Cost / 1M
$0.05
$4.00
Output Cost / 1M
$0.40
$20.00
Context Window
400,000 tokens
1,000,000 tokens

Verdict

If you are looking for pure performance and capability, Tie is statistically superior. However, if API burn rate is the primary concern, OpenAI: GPT-5 Nano wins out aggressively in pricing.

People Also Ask

Is OpenAI: GPT-5 Nano cheaper than Anthropic: Claude Opus 5.5?

Yes. OpenAI: GPT-5 Nano is cheaper for both input and output generation compared to Anthropic: Claude Opus 5.5. Exploring alternatives often yields cost reductions.

Which model has the larger context window?

The Anthropic: Claude Opus 5.5 model has the advantage in memory, offering a massive 1,000,000 token limit for document ingestion.

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