GPT-5.5 vs GPT-5.4 vs Gemini 3.1 Pro
Pick two to four models to compare benchmark scores, prices, context windows and speed. The link updates as you pick, so you can share the exact comparison.
Cheapest blended
Gemini 3.1 Pro
$4.50 / 1M tokens
Largest context
GPT-5.5GPT-5.4
Tie at 1.05M tokens
Fastest output
Gemini 3.1 Pro
114 tokens/s
Top on Terminal-Bench 2.0
GPT-5.5
82.7%
Specifications
| Spec | GPT-5.5OpenAI | GPT-5.4OpenAI | Gemini 3.1 ProGoogle |
|---|---|---|---|
| Provider | OpenAI | OpenAI | |
| Released | 24 Apr 2026 | 5 Mar 2026 | 19 Feb 2026 |
| Licence | Proprietary | Proprietary | ProprietaryPreview |
| Context window | 1.05M tokens | 1.05M tokens | 1.05M tokens |
| Max output | 128K tokens | 128K tokens | 66K tokens |
| Input / 1M | $5.00* | $2.50* | $2.00* |
| Output / 1M | $30.00 | $15.00 | $12.00 |
| Cached input / 1M | $0.50 | $0.25 | $0.20 |
| Speed | 86 tokens/s | 88 tokens/s | 114 tokens/s |
| Input types | text, image | text, image | text, image, video, audio, pdf |
| Best for | CodingAgents | CodingAgents | ReasoningCodingAgentsMultimodal |
* GPT-5.5: There is no separate cache-write charge (pre-GPT-5.6 models). Batch and Flex: $2.50 / $15. Fast mode: 2.5x, $12.50 / $75. Snapshot gpt-5.5-2026-04-23. GPT-5.5 Pro (gpt-5.5-pro) costs $30 / $180. Data residency +10%.
* GPT-5.4: There is no separate cache-write charge. Batch and Flex: $1.25 / $7.50. Fast mode: $5 / $30. Snapshot gpt-5.4-2026-03-05. Data residency +10%.
* Gemini 3.1 Pro: Still preview. A separate endpoint, gemini-3.1-pro-preview-customtools, has the same price. Cache storage $4.50 per 1M tokens per hour. Priority is $3.60 / $21.60 up to 200K.
Benchmark scores
Officially reported scores only. A model with no published score on a benchmark shows a line, not a zero.
Price per 1M tokens
Context window and speed
Notes
- GPT-5.5
- A frontier model for coding and complex professional work, the flagship before GPT-5.6.
- GPT-5.4
- A frontier model for professional work and coding, and OpenAI's first general-purpose model with native computer use. It is now a lower-cost alternative to GPT-5.5.
- Gemini 3.1 Pro
- Google's current Pro model, still preview. Built for multimodal understanding, agentic work and vibe-coding, with a focus on software engineering and multi-step tool use.
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