Last verified 2026-02-11 (left) · 2026-03-06 (right)
Claude Sonnet 4.5 vs GPT-5.4 Pro — Pricing & Capability Comparison
Claude Sonnet 4.5 charges $3.00 per million input tokens and $15.00 per million output tokens. GPT-5.4 Pro comes in at $30.00 / $180.00. Context windows span 200K vs 1.1M tokens respectively.
TL;DR — Quick Comparison
- ✓Claude Sonnet 4.5 is cheaper overall: $18.00 per 1M tokens (in+out) vs $210.00 for GPT-5.4 Pro — saves $192.00 per 1M tokens
- ✓Input pricing: Claude Sonnet 4.5 $3.00/1M vs GPT-5.4 Pro $30.00/1M
- ✓Output pricing: Claude Sonnet 4.5 $15.00/1M vs GPT-5.4 Pro $180.00/1M
- ✓Context window: GPT-5.4 Pro offers more (1.1M vs 200K)
- ✓Use our calculator below to estimate costs for your specific usage pattern
Input price (per 1M)
Claude Sonnet 4.5
$3.00
GPT-5.4 Pro
$30.00
Claude Sonnet 4.5 leads here
Output price (per 1M)
Claude Sonnet 4.5
$15.00
GPT-5.4 Pro
$180.00
Claude Sonnet 4.5 leads here
Context window
Claude Sonnet 4.5
200,000 tokens
GPT-5.4 Pro
1,050,000 tokens
GPT-5.4 Pro leads here
Cached input
Claude Sonnet 4.5
$0.300
GPT-5.4 Pro
Not published
Claude Sonnet 4.5 leads here
Cost comparison for 10K-token workloads
Side-by-side pricing for identical workloads (10,000 total tokens per request) across different distributions.
| Scenario | Claude Sonnet 4.5 | GPT-5.4 Pro | Claude Sonnet 4.5 cached |
|---|---|---|---|
Balanced conversation 50% input · 50% output | $0.0900 | $1.05 | $0.0765 |
Input-heavy workflow 80% input · 20% output | $0.0540 | $0.600 | $0.0324 |
Generation heavy 30% input · 70% output | $0.114 | $1.35 | $0.106 |
Cached system prompt 90% cached input · 10% fresh output | $0.0420 | $0.450 | $0.0177 |
Frequently asked questions
Which is cheaper: Claude Sonnet 4.5 or GPT-5.4 Pro?
Claude Sonnet 4.5 is cheaper for input tokens at $3.00 per 1M tokens compared to $30.00. For output, Claude Sonnet 4.5 costs $15.00 per 1M tokens versus $180.00 for GPT-5.4 Pro.
What is the cost per 1M tokens for Claude Sonnet 4.5?
Claude Sonnet 4.5 pricing: $3.00 per 1M input tokens and $15.00 per 1M output tokens. Context window: 200,000 tokens.
What is the cost per 1M tokens for GPT-5.4 Pro?
GPT-5.4 Pro pricing: $30.00 per 1M input tokens and $180.00 per 1M output tokens. Context window: 1,050,000 tokens.
How much does it cost per 1K tokens?
Per 1K tokens: Claude Sonnet 4.5 costs $0.0030 input / $0.0150 output. GPT-5.4 Pro costs $0.0300 input / $0.1800 output. This is useful for calculating small-scale usage costs.
Which model supports a larger context window?
GPT-5.4 Pro offers 1,050,000 tokens (1.1M) versus 200K for Claude Sonnet 4.5.
What is the estimated monthly cost for typical usage?
For a typical workload of 10M input + 2M output tokens per month: Claude Sonnet 4.5 would cost approximately $60.00, while GPT-5.4 Pro would cost $660.00. Claude Sonnet 4.5 is more economical for this usage pattern.
Do these models support prompt caching?
Claude Sonnet 4.5 supports prompt caching at $0.300 per 1M cached tokens, reducing costs for repeated context by up to 90%. GPT-5.4 Pro does not publish cached pricing.
Which model is best for my use case?
Choose Claude Sonnet 4.5 for cost-sensitive applications with high input volume. Choose GPT-5.4 Pro if you need 1.1M context for long documents or conversations. Consider prompt caching if you have repeated context. Use our token calculator to model your specific usage pattern.