Gemini 3.5 vs GPT-5
2026 - Pricing, benchmarks, and use case comparison
Quick take
- •Gemini 3.5 has a 1M context window - 8x larger than GPT-5's 128K. Better for long documents and large codebases.
Specs comparison
| Gemini 3.5 | GPT-5 | |
|---|---|---|
| Provider | Google DeepMind | OpenAI |
| Type | Closed source | Closed source |
| Context window | ✓1M | 128K |
| Input / 1M tokens | TBA | $10.00 |
| Output / 1M tokens | TBA | $30.00 |
| Release date | 2026-05 | 2025-06 |
Strengths
Gemini 3.5
- ✓Action-first architecture for agentic and multi-step workflows
- ✓1M token context window - largest in class
- ✓Powers Google Antigravity CLI for terminal-native coding
- ✓Native Workspace integration with autonomous task execution
- ✓Companion Gemini Omni handles anything-to-anything multimodal generation
GPT-5
- ✓Strong general-purpose reasoning
- ✓Excellent multimodal understanding
- ✓Broad domain knowledge
- ✓Consistent instruction following
- ✓Widely supported by third-party tools
Which should you choose?
Choose Gemini 3.5 if you need...
- →Agentic workflows requiring multi-step tool use
- →Large codebase comprehension and editing
- →Google Workspace automation
- →Long document and multimodal analysis
Choose GPT-5 if you need...
- →General-purpose API integrations
- →Multimodal applications
- →Complex reasoning tasks
- →Enterprise deployments