GPT-5.4 Mini vs GPT-5.5
GPT-5.4 Mini and GPT-5.5 are both current openai production-tier models. GPT-5.4 Mini is meaningfully cheaper at $0.75 / $4.5 per 1M. GPT-5.5 has a 1.1M context window — about 3× the 400k of GPT-5.4 Mini. GPT-5.5 leads on coding, reasoning, general knowledge.
Specs side by side
| Metric | OpenAI GPT-5.4 Mini | OpenAI GPT-5.5 |
|---|---|---|
| Input price (per 1M) | $0.75 | $5 |
| Output price (per 1M) | $4.5 | $30 |
| Context window | 400k tokens | 1.1M tokens |
| Speed tier | fast | balanced |
| Open weights | No | No |
| EU region | Yes | Yes |
| Free tier | No | No |
| Prompt caching | Yes | Yes |
| Vision input | Yes | Yes |
| Extended thinking | Yes | Yes |
When to choose each
Choose GPT-5.4 Mini if…
- Cost is a priority ($0.75 / $4.5 per 1M vs $5 / $30 per 1M)
Choose GPT-5.5 if…
- You need 1.1M context (3× more than GPT-5.4 Mini)
- You need realtime speech-to-speech
- Coding is central to your workload
- Reasoning is central to your workload
Benchmark delta
GPT-5.4 Mini leads on
GPT-5.4 Mini has no meaningful benchmark lead in this pair.
GPT-5.5 leads on
- Coding
- Reasoning
- General knowledge
- Instruction following
- Multilingual
- Vision
- Tool use
FAQ — GPT-5.4 Mini vs GPT-5.5
GPT-5.4 Mini vs GPT-5.5 — which is better?
GPT-5.4 Mini and GPT-5.5 are both current openai production-tier models. GPT-5.4 Mini is meaningfully cheaper at $0.75 / $4.5 per 1M. GPT-5.5 has a 1.1M context window — about 3× the 400k of GPT-5.4 Mini. GPT-5.5 leads on coding, reasoning, general knowledge. The right pick depends on your use case — see "When to choose each" above for a data-driven decision.
How does GPT-5.4 Mini pricing compare to GPT-5.5?
GPT-5.4 Mini costs $0.75 / $4.5 per 1M vs GPT-5.5 at $5 / $30 per 1M. GPT-5.4 Mini is cheaper on output tokens by roughly 567%. Both support prompt caching, which reduces effective cost by 80-90% on repeat system prompts.
Does GPT-5.4 Mini or GPT-5.5 have the bigger context window?
GPT-5.5 has a 1.1M-token context window — 3× the 400k context of GPT-5.4 Mini. Enough for entire codebases, books, or multi-document RAG.
Is there a free tier for GPT-5.4 Mini or GPT-5.5?
GPT-5.4 Mini: no — Near-free at $0.75/$4.50 per 1M; starter credits only. GPT-5.5: no — Paid-only — no free API tier; available via ChatGPT Plus/Pro.
Which is better for coding — GPT-5.4 Mini or GPT-5.5?
GPT-5.5 leads on coding benchmarks (GPT-5.4 Mini: 84/100, GPT-5.5: 95/100). For production coding agents also weigh tool-use performance — GPT-5.4 Mini scores 86, GPT-5.5 scores 94.