Claude Sonnet 5 vs GPT-5.4
Claude Sonnet 5 is the better default for most production use cases — comparable quality at lower cost.
Claude Sonnet 5 ($3/M input) vs GPT-5.4 ($2.50/M input) — nearly the same price but Claude Sonnet 5 has a 200K context window vs GPT-5.4's 128K. On output, they're the same ($15/M). For most production workloads, Sonnet 5 is the right starting point; use GPT-5.4 if you need strict structured output mode or already have an OpenAI-centered infrastructure.
Side-by-side pricing
| Claude Sonnet 5 | GPT-5.4 | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Input price/1M | $3.00 | $2.50 |
| Output price/1M | $15.00 | $15.00 |
| Cache read/1M | $0.30 | $0.25 |
| Context window | 200K | 1M |
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Prompt caching | ✓ | ✓ |
| Speed tier | Standard | Standard |
Prices verified 2026-08-20. See changelog for history.
Winner by task
Calculate costs for each model
Frequently Asked Questions
Which is cheaper: GPT-5.4 or Claude Sonnet 5?
GPT-5.4 is slightly cheaper on input ($2.50 vs $3.00/M) and they're the same on output ($15/M). For input-heavy workloads (long documents), GPT-5.4 saves ~17% on input costs. For output-heavy workloads (long-form generation), they're identical.
Prices verified 2026-08-20. See methodology for calculation details.