GPT-5.4 (released March 5, 2026) and Gemini 2.5 Pro are two flagship models that take very different approaches. OpenAI bets on reasoning depth and computer use. Google bets on context length and ecosystem integration. Here’s the honest comparison.
Quick Comparison
| GPT-5.4 | Gemini 2.5 Pro | |
|---|---|---|
| Provider | OpenAI | |
| Release | March 5, 2026 | March 2025 (updated) |
| Context window | 272K standard (1.05M extended) | 1M tokens |
| Max output | 128K tokens | 64K tokens |
| Input price | $2.50 / 1M tokens | $1.25 / 1M tokens |
| Output price | $15.00 / 1M tokens | $10.00 / 1M tokens |
| Extended context | 2x pricing above 272K | Included |
| Vision | ✅ | ✅ (image + video) |
| Computer use | ✅ | ❌ |
| Tool use | ✅ | ✅ |
Pricing
Gemini 2.5 Pro is cheaper across the board — 50% less on input, 33% less on output. And its 1M context comes at no extra cost, while GPT-5.4 charges double rates above 272K tokens. For high-volume workloads, Gemini has a clear cost advantage.
Context Window
Both models support roughly 1M tokens, but the economics are different. Gemini’s 1M context is standard pricing. GPT-5.4’s standard window is 272K — you can go up to 1.05M, but everything above 272K is billed at 2x the normal rate.
If you regularly work with large codebases or long documents, Gemini is significantly cheaper for long-context use.
Reasoning
GPT-5.4 leads on abstract reasoning benchmarks. It scored 54.2% on ARC-AGI-2 compared to Gemini’s 45.1%, and hit a perfect 100% on the AIME 2025 mathematics test. For the hardest logical and mathematical problems, GPT-5.4 has an edge.
Gemini 2.5 Pro is competitive on most reasoning tasks and its thinking mode (configurable via thinkingBudget) lets you trade latency for reasoning depth.
Coding
GPT-5.4 scores 80% on SWE-bench. Gemini 2.5 Pro is close but slightly behind on complex software engineering tasks. GPT-5.4 also supports native computer use — it can interact with desktop applications, browsers, and terminals directly.
Output Length
GPT-5.4 can output up to 128K tokens — double Gemini’s 64K. For generating complete documentation, long code files, or detailed reports, GPT-5.4 has the advantage.
Multimodal
Both handle images well. Gemini adds native video understanding, which GPT-5.4 doesn’t offer. If your workflow involves video analysis, Gemini is the only choice between these two.
Ecosystem
GPT-5.4 integrates with the OpenAI platform — custom GPTs, assistants API, real-time voice, tool search, and the broadest third-party integration support. Gemini integrates with Google Workspace, Vertex AI, and the broader Google Cloud ecosystem.
Your existing stack probably makes this decision for you.
When to Use Each
Pick GPT-5.4 if you:
- Need the strongest reasoning for math and logic
- Want native computer use capabilities
- Need very long outputs (128K tokens)
- Use OpenAI’s assistants API or custom GPTs
- Want the broadest third-party integration ecosystem
Pick Gemini 2.5 Pro if you:
- Are cost-sensitive (50% cheaper on input)
- Need long context at base pricing (1M included)
- Need video understanding
- Are in the Google Cloud / Workspace ecosystem
- Want a generous free tier for experimentation
The Bottom Line
Gemini 2.5 Pro offers better value — cheaper pricing, free 1M context, and video support. GPT-5.4 wins on raw reasoning, output length, and computer use capabilities. For developers not locked into either ecosystem, the choice depends on whether you value cost efficiency (Gemini) or cutting-edge capabilities (GPT-5.4).