Last verified 2025-09-22 (left) · 2026-03-06 (right)
Claude Sonnet 3.7 (Legacy) vs GPT-5.4 — Pricing & Capability Comparison
Claude Sonnet 3.7 (Legacy) charges $3.00 per million input tokens and $15.00 per million output tokens. GPT-5.4 comes in at $2.50 / $15.00. Context windows span 200K vs 1.1M tokens respectively.
TL;DR — Quick Comparison
- ✓GPT-5.4 is cheaper overall: $17.50 per 1M tokens (in+out) vs $18.00 for Claude Sonnet 3.7 (Legacy) — saves $0.50 per 1M tokens
- ✓Input pricing: Claude Sonnet 3.7 (Legacy) $3.00/1M vs GPT-5.4 $2.50/1M
- ✓Output pricing: Claude Sonnet 3.7 (Legacy) $15.00/1M vs GPT-5.4 $15.00/1M
- ✓Context window: GPT-5.4 offers more (1.1M vs 200K)
- ✓Use our calculator below to estimate costs for your specific usage pattern
Input price (per 1M)
Claude Sonnet 3.7 (Legacy)
$3.00
GPT-5.4
$2.50
GPT-5.4 leads here
Output price (per 1M)
Claude Sonnet 3.7 (Legacy)
$15.00
GPT-5.4
$15.00
Claude Sonnet 3.7 (Legacy) leads here
Context window
Claude Sonnet 3.7 (Legacy)
200,000 tokens
GPT-5.4
1,050,000 tokens
GPT-5.4 leads here
Cached input
Claude Sonnet 3.7 (Legacy)
Not published
GPT-5.4
$0.250
GPT-5.4 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 3.7 (Legacy) | GPT-5.4 | GPT-5.4 cached |
|---|---|---|---|
Balanced conversation 50% input · 50% output | $0.0900 | $0.0875 | $0.0762 |
Input-heavy workflow 80% input · 20% output | $0.0540 | $0.0500 | $0.0320 |
Generation heavy 30% input · 70% output | $0.114 | $0.112 | $0.106 |
Cached system prompt 90% cached input · 10% fresh output | $0.0420 | $0.0375 | $0.0172 |
Frequently asked questions
Which is cheaper: Claude Sonnet 3.7 (Legacy) or GPT-5.4?
GPT-5.4 is cheaper for input tokens at $2.50 per 1M tokens compared to $3.00. For output, Claude Sonnet 3.7 (Legacy) costs $15.00 per 1M tokens versus $15.00 for GPT-5.4.
What is the cost per 1M tokens for Claude Sonnet 3.7 (Legacy)?
Claude Sonnet 3.7 (Legacy) 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?
GPT-5.4 pricing: $2.50 per 1M input tokens and $15.00 per 1M output tokens. Context window: 1,050,000 tokens.
How much does it cost per 1K tokens?
Per 1K tokens: Claude Sonnet 3.7 (Legacy) costs $0.0030 input / $0.0150 output. GPT-5.4 costs $0.0025 input / $0.0150 output. This is useful for calculating small-scale usage costs.
Which model supports a larger context window?
GPT-5.4 offers 1,050,000 tokens (1.1M) versus 200K for Claude Sonnet 3.7 (Legacy).
What is the estimated monthly cost for typical usage?
For a typical workload of 10M input + 2M output tokens per month: Claude Sonnet 3.7 (Legacy) would cost approximately $60.00, while GPT-5.4 would cost $55.00. GPT-5.4 is more economical for this usage pattern.
Do these models support prompt caching?
Claude Sonnet 3.7 (Legacy) does not publish cached pricing. GPT-5.4 supports caching at $0.250 per 1M tokens, saving up to 90%.
Which model is best for my use case?
Choose GPT-5.4 for cost-sensitive applications with high input volume. Choose GPT-5.4 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.