GPT-4.1 vs GPT-5.5
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
GPT-4.1
OpenAI · Apr 2025
A non-reasoning workhorse with a 1M-token context window, still popular for predictable-latency production APIs.
GPT-5.5
77.2OpenAI · Apr 2026
OpenAI's flagship reasoning model with a 1M-token context window, built for hard coding, science and long-horizon agentic work.
The verdict
GPT-5.5 wins 2 of the 2 benchmarks these models share, against 0 for GPT-4.1. On price the gap is dramatic: GPT-4.1 works out roughly 3.2x cheaper per blended million tokens.
Benchmark head-to-head 0–2
Specs & pricing
| GPT-4.1 | GPT-5.5 | |
|---|---|---|
| modhub Index | — | 77.2 |
| Input price / 1M | $2 | $5 |
| Output price / 1M | $8 | $30 |
| Context window | 1M | 1M |
| Max output | 33K | 128K |
| Open weights | no | no |
| Reasoning model | no | yes |
| Multimodal input | text, image | text, image |
| Knowledge cutoff | Jun 2024 | Jan 2026 |
| Released | Apr 2025 | Apr 2026 |
| Example monthly cost* | $32.00 | $95.00 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, GPT-4.1 or GPT-5.5?
- GPT-5.5 wins 2 of the 2 benchmarks these models share, against 0 for GPT-4.1. On price the gap is dramatic: GPT-4.1 works out roughly 3.2x cheaper per blended million tokens.
- Which is cheaper, GPT-4.1 or GPT-5.5?
- GPT-4.1 costs $2/$8 per million input/output tokens, while GPT-5.5 costs $5/$30. For a typical workload of 10M input and 1.5M output tokens per month, that's $32.00 versus $95.00.
- Which model is better for coding, GPT-4.1 or GPT-5.5?
- On SWE-bench Verified — the standard agentic-coding benchmark — GPT-5.5 scores 82.6% versus 54.6% for GPT-4.1, making GPT-5.5 the stronger pick for coding agents.