Gemini 3 Deep Think alternatives
Looking for an alternative to Gemini 3 Deep Think? Here are the 6 closest llm provider / model options for AI coding, each ranked by how well it replaces Gemini 3 Deep Think — with the concrete reason to switch.
Quick comparison
| Model | Input price | SWE-bench | Context window | Speed |
|---|---|---|---|---|
| Gemini 3 Deep Think (you) | $5 | 80% | 1M+ | Slow/Reasoning |
| GPT-5.5 | $5 | 75% | 1M+ | Standard |
| GPT-5.5 Pro | $30 | 78% | 1M+ | Slow/Reasoning |
| o3 | $10 | 71% | 200K | Slow/Reasoning |
| Grok 5 | $5 | 72% | 1M+ | Medium |
| Gemini 3 Pro | $2 | 76% | 1M+ | Medium |
| GPT-5.1 | $1.25 | 76% | 400K | Medium |
The best Gemini 3 Deep Think alternatives
GPT-5.5
Frontier reasoning, agentic coding, long-context refactors, multimodal analysis, replaces GPT-5.4 as default flagship
Why consider it instead:
- Built for: Frontier reasoning, agentic coding, long-context refactors, multimodal analysis, replaces GPT-5.4 as default flagship
Hardest reasoning problems, math olympiad, research-grade analysis, mission-critical coding tasks where cost is no object
Why consider it instead:
- Built for: Hardest reasoning problems, math olympiad, research-grade analysis, mission-critical coding tasks where cost is no object
o3
Hardest coding problems, complex multi-step reasoning, advanced debugging
Why consider it instead:
- Built for: Hardest coding problems, complex multi-step reasoning, advanced debugging
Grok 5
Real-time web/X context, long-context analysis, and agentic browsing
Why consider it instead:
- Built for: Real-time web/X context, long-context analysis, and agentic browsing
Long-horizon agentic tasks, generative UI, multi-modal reasoning, Antigravity-driven workflows
Why consider it instead:
- Cheaper — $2/1M input vs $5, ~2.5× less
GPT-5.1
Default daily-driver coding agent with adaptive reasoning and warmer chat tone
Why consider it instead:
- Cheaper — $1.25/1M input vs $5, ~4.0× less
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