GPT-5.1 Codex alternatives
Looking for an alternative to GPT-5.1 Codex? Here are the 6 closest llm provider / model options for AI coding, each ranked by how well it replaces GPT-5.1 Codex — with the concrete reason to switch.
Quick comparison
| Model | Input price | SWE-bench | Context window | Speed |
|---|---|---|---|---|
| GPT-5.1 Codex (you) | $1.25 | 75% | 400K | Medium |
| Gemini 3 Pro | $2 | 76% | 1M+ | Medium |
| GPT-5.1 | $1.25 | 76% | 400K | Medium |
| GPT-5.5 | $5 | 75% | 1M+ | Standard |
| Qwen 3 Max | $1.50 | 68% | 1M+ | Medium |
| Gemini 2.5 Pro | $1.25 | 63% | 1M+ | Standard |
| Claude Sonnet 4.6 | $3 | 64% | 200K | Standard |
The best GPT-5.1 Codex alternatives
Long-horizon agentic tasks, generative UI, multi-modal reasoning, Antigravity-driven workflows
Why consider it instead:
- Higher SWE-bench (76% vs 75%)
- Bigger context window (1M+)
GPT-5.1
Default daily-driver coding agent with adaptive reasoning and warmer chat tone
Why consider it instead:
- Higher SWE-bench (76% vs 75%)
GPT-5.5
Frontier reasoning, agentic coding, long-context refactors, multimodal analysis, replaces GPT-5.4 as default flagship
Why consider it instead:
- Bigger context window (1M+)
Long-context coding, multilingual codebases, China-region deployments
Why consider it instead:
- Bigger context window (1M+)
Advanced reasoning, multimodal workflows, massive context tasks, agentic coding
Why consider it instead:
- Bigger context window (1M+)
Day-to-day coding, fast agentic loops, balanced cost/quality
Why consider it instead:
- Built for: Day-to-day coding, fast agentic loops, balanced cost/quality
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