GPT-5.1
LLM Provider / Model · Default daily-driver coding agent with adaptive reasoning and warmer chat tone
At a glance
| Input price | $1.25 |
| Output price | $10 |
| Cache price | $0.125 |
| Price tier | Mid |
| Context window | 400K |
| Max output | 128K |
| Context tier | 128K-500K |
| Speed tier | Medium |
| Latency | medium |
| Knowledge cutoff | Oct 2025 |
| Modality | Multimodal (vision) |
| Model ID | gpt-5.1 |
| Provider | OpenAI |
| HumanEval | 95% |
| MMLU | 89% |
| SWE-Bench | 76% |
| Benchmark | Strong on AIME, SWE-bench, Tau-Bench |
| Released | Nov 2025 |
| Hosting | Closed/API |
| Capabilities | Vision, Tool use, Adaptive reasoning, Streaming, Structured output, Function calling, Prompt caching, Personality presets |
What GPT-5.1 does
Vision, Tool use, Adaptive reasoning, Streaming, Structured output, Function calling, Prompt caching, Personality presets
Best for
Default daily-driver coding agent with adaptive reasoning and warmer chat tone
Works well with
Integration
Agent / Orchestration
Conflicts & caveats
- Kiro's spec mode is tuned for Claude models — GPT-5.1 may work but spec-driven flows are best with Claude.
- Gemini CLI is locked to Google Gemini models — your LLM is GPT-5.1.
- Claude Code only works with Claude models — your LLM is GPT-5.1.
- Devin uses Cognition's proprietary model internally — your selected GPT-5.1 will be ignored.
- OpenAI Codex (Cloud) runs GPT-5.1 Codex internally — your selected GPT-5.1 will be ignored.
- Jules runs Gemini models internally — your selected GPT-5.1 will be ignored.
- The Claude Code SDK is tuned for Claude models — GPT-5.1 may work via the model adapter but loses Claude-specific features (thinking, prompt caching, sub-agents).
- Lovable uses a fixed internal model — your selected GPT-5.1 will be ignored.
- Replit Agent 3 uses its own model selection internally — your selected GPT-5.1 will be ignored.
Build a full stack around GPT-5.1 — Flowpicker shows compatibility warnings before you commit.
Open the stack planner →