GPT-5.5 vs o3
o3 leads in 3 of 8 categories
Arena ELO
o3
Cheaper
GPT-5.5
Faster
o3
Detailed Comparison
| Category | GPT-5.5 | o3 |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Context Window | 128K | 200K WIN |
| Input Price ($/1M) | $5 WIN | $10 |
| Output Price ($/1M) | $30 WIN | $40 |
| Arena ELO | N/A | 1350 WIN |
| Coding | N/A | unknown |
| Reasoning | N/A | unknown |
| Speed (tokens/sec) | N/A | ~30 t/s WIN |
| Open Source | No | No |
Frequently Asked Questions
Which is cheaper, GPT-5.5 or o3?
GPT-5.5 is approximately 30% cheaper than o3 per million tokens.
Which is better for coding, GPT-5.5 or o3?
GPT-5.5 scores N/A on coding benchmarks, while o3 scores unknown.
Which has a larger context window?
GPT-5.5 supports 128K context, while o3 supports 200K.
Is GPT-5.5 or o3 open source?
GPT-5.5 is proprietary. o3 is proprietary.
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