Claude Sonnet 4.5 vs GPT-5.4 Nano

Price, context window & benchmark comparison

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Claude Sonnet 4.5

Anthropic
$3.00 / $15.00
Input / Output · per 1M tokens
VS
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GPT-5.4 Nano

OpenAI
$0.20 / $1.25
Input / Output · per 1M tokens
Compare different models
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Verdict: GPT-5.4 Nano is 13.0× cheaper than Claude Sonnet 4.5 on a typical 3:1 input/output mix. Claude Sonnet 4.5 has the larger context window (1M vs 400K).
Claude Sonnet 4.5GPT-5.4 Nano
Input price / 1M$3.00$0.20
Output price / 1M$15.00$1.25
Blended price (3:1)$6.00$0.46
Cached input / 1M$0.30$0.02
Context window1M400K
Max output64K128K
Intelligence index20.720.7
Coding index52.156.1
Providers——
Best provider uptime (30m)——
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2025-09-292026-03-17
Retirement——

Cost calculator

FAQ

Which is cheaper, Claude Sonnet 4.5 or GPT-5.4 Nano?

GPT-5.4 Nano is 13.0× cheaper than Claude Sonnet 4.5 on a typical 3:1 input/output mix.

Claude Sonnet 4.5 vs GPT-5.4 Nano: which has a bigger context window?

Claude Sonnet 4.5: 1,000,000 tokens. GPT-5.4 Nano: 400,000 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Claude Sonnet 4.5 ≈ $13,500, GPT-5.4 Nano ≈ $1,025.

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