The meaningful difference
Both expose roughly million-token context windows, but GPT-4.1 is positioned around API instruction following and code editing while Gemini 2.5 Pro emphasizes multimodal reasoning. Their listed prices and evaluation settings are not directly interchangeable.
Choose by workload
Choose GPT-4.1 when your priority is API code editing, precise instruction following, and repository-scale text inputs. Its relevant strengths include million-token context window and reliable instruction following.
Choose Gemini 2.5 Pro when your priority is multimodal research across documents, images, audio, and video. Account for tiered pricing is workload-dependent before committing.
Specification comparison
| Measure | GPT-4.1 | Gemini 2.5 Pro |
|---|---|---|
| Access | API | API + app |
| License | Proprietary | Proprietary |
| Context | 1.0M | 1.0M |
| Provider-listed API input / 1M | $2.00 | $1.25 |
| Provider-listed API output / 1M | $8.00 | $10.00 |
| MMLU-Pro | 83.7 | 86.2 |
| GPQA Diamond | 66.3 | 84 |
| SWE-bench Verified | 54.6 | 63.8 |
| LiveCodeBench | 44.7 | 48.1 |
| SWE-Bench Pro | — | — |
| Artificial Analysis Intelligence Index | — | — |
Price scope: Listed token prices are provider API snapshots. Gemini pricing can vary by workload and tier, so verify current billing rules against representative input and output volumes.
A fair test for this pair
Give both models the same long repository task and a separate mixed-media research task. Score accepted edits, citation accuracy, omitted evidence, latency, and total input/output cost separately.