OpenRouter model
OpenAI: gpt-oss-20b
gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass, optimized for...
- Provider
- OpenRouter
- Availability
- Available
- Model ID
- openai/gpt-oss-20b
- Snapshot
- 2026-10-07
OpenAI: gpt-oss-20b Benchmarks & Agentic Accuracy
Verified primary research & developer preference metrics
What This Means in Real Software Development
- Fits on single consumer GPUs (24GB VRAM) via 4-bit/8-bit quantization.
- Scores 41.0% on SWE-bench Verified without needing cloud API keys.
- Fast execution for rapid local symbol search and linting.
- Complete offline air-gapped development support.
Swarm Multi-Agent Topology
Best Paired With: gpt-oss-120b or Claude 3.7 Sonnet
Fast local AST symbol indexing and lint check loops with zero API cost.
Dispatched across local Git worktrees via Ollama or vLLM.
What Developers & Practitioners Are Saying
Real-world field observations, production strengths, and developer consensus
"Lightweight open-weights model designed for local workstations and developer laptops."
Verified Real-World Strengths
- Can be quantized to 4-bit and run locally on Apple Silicon or consumer GPUs
- Fast local inference without cloud network latency
- Zero data privacy risk
Production Caveats & Gaps
- Lower SWE-bench score (28.5%) compared to frontier cloud models
Primary Sources & Methodology Citations
- OpenAI Open-Weights Models Report — OpenAI (September 2025)
OpenAI: gpt-oss-20b model overview
OpenAI: gpt-oss-20b is listed in the public Swarm catalog through OpenRouter. This page summarizes the verified catalog fields used by Swarm without claiming real-time access for every provider account.
- Provider
- OpenRouter
- Family
- OpenRouter
- Context window
- 131.1K tokens
- Thinking support
- low · medium · high
- Availability status
- Available
- Catalog ID
- openrouter/openai/gpt-oss-20b
Run OpenAI: gpt-oss-20b in Swarm
Verified CLI workflow & multi-agent architecture
swarm ctl model set --provider openrouter --model openrouter/openai/gpt-oss-20b# Or switch interactively inside the terminal TUI:
/modelsSubagent Role Matrix
Assign OpenAI: gpt-oss-20b to specialized system roles in ~/.swarm/config.json:
- Primary / Planner: Orchestrates full task DAGs and multi-stage pipelines.
- Coder Subagent: Generates code and unit tests inside private Git worktrees.
- Finder Subagent: Performs read-only code search, symbol discovery, and mapping.
Public catalog snapshot. Catalog availability is not a real-time provider status or an access guarantee.