GPT-5.5 vs GPT-5.4
Side-by-side comparison of API pricing, specs, benchmarks, and capabilities
|
by OpenAI
|
by OpenAI
|
|
|---|---|---|
| Overview | ||
| Status | Current flagship | Current flagship |
| Released | Nov 15, 2025 | Aug 15, 2025 |
| Pricing per million tokens | ||
| Input | $5.00/Mtok | $2.50/Mtok |
| Output | $30.00/Mtok | $15.00/Mtok |
| Blended avg | $17.50/Mtok | $8.75/Mtok |
| Cached input | $0.500/Mtok | $0.250/Mtok |
| Specifications | ||
| Context window | 270K tokens | 1M tokens |
| Parameters | Proprietary | Proprietary |
| Speed (TPS) | — | — |
| Modalities | ||
| Input |
textimageaudio
|
textimage
|
| Benchmarks from Vellum LLM Leaderboard | ||
| Avg benchmark score | 64 | 78.7 |
| Perf / dollar | 3.7 | 9 |
| GPQA Diamond | — | 88 |
| SWE-Bench | — | 75 |
| HumanEval | — | 94.5 |
| MATH 500 | — | 92 |
| Providers | ||
| Available from |
OpenAI — $5.00/$30.00/Mtok
|
OpenAI — $2.50/$15.00/Mtok
|
Cost at scale — 1M tokens (50/50 input/output)
| Volume | GPT-5.5 | GPT-5.4 | Savings |
|---|---|---|---|
| 1M tokens | $17.5 | $8.75 | $8.75 (50%) |
| 10M tokens | $175 | $87.5 | $87.5 (50%) |
| 100M tokens | $1750 | $875 | $875 (50%) |
| 1000M tokens | $17500 | $8750 | $8750 (50%) |
Summary
GPT-5.5 by OpenAI costs $5.00/Mtok input and $30.00/Mtok output, with a 270K-token context window. It supports text, image, audio input.
GPT-5.4 by OpenAI costs $2.50/Mtok input and $15.00/Mtok output, with a 1M-token context window. It supports text, image input.
On a blended cost basis, GPT-5.4 is 100% cheaper than GPT-5.5. It also has a larger context window.
On benchmarks, GPT-5.4 scores higher (78.7 vs 64) on average. In terms of value, GPT-5.4 has better performance per dollar (9 vs 3.7).
Note: Pricing is per million tokens. Actual costs vary with usage patterns, prompt caching, and batch discounts. Always verify against official provider pricing pages.