ChidorivsLegion
Generated from the two spec rows. Green marks the better value where a spec has a clear direction. Everything else is just different.
Chidori
Thousand Birds · Agent framework
OSS
Panel
6.63 spec wins
- Reliability
- 6.3
- Usefulness
- 6.2
- Cost
- 8.7
- Longevity
- 5.2
“It can suspend an agent to disk for days while it waits for a human answer, which is a realistic model of human response time.”
Legion
Software Mansion · Agent framework
OSS
Panel
6.52 spec wins
- Reliability
- 6.0
- Usefulness
- 6.2
- Cost
- 8.0
- Longevity
- 5.8
“It writes Lua to get work done in Elixir, which is two functional languages agreeing that a third one should take the blame.”
Spec by spec
| Spec | Chidori | Legion |
|---|---|---|
| Architecture | ||
| Category | Agent framework | Agent framework |
| Runs | local | local |
| Platforms | macos, linux | macos, linux |
| Context window | not documented | not documented |
| Protocols | ||
| MCP client | No | No |
| MCP server | No | No |
| Capabilities | ||
| Runs terminal commands | No | No |
| Multi-file edits | No | Yes |
| Git operations | No | No |
| Browser control | No | No |
| Sandboxed execution | No | YesLegion runs generated Lua or Elixir in its own sandbox; the README does not describe a container runtime. |
| Multi-agent orchestration | No | No |
| Headless / CI mode | YesA checkpointed run can be committed to git and replayed as an integration test that makes no model calls. | No |
| Models | ||
| Backbone | Anthropic, OpenAI, DeepSeek, Groq, Ollama, vLLM, any OpenAI-compatible endpoint | multiple providers |
| Bring your own model | Yes | Yes |
| Local models | YesCHIDORI_OPENAI_COMPAT_URL or OPENAI_BASE_URL points the runtime at any OpenAI-compatible endpoint; Ollama, vLLM and LiteLLM are named in the README. | No |
| Cost | ||
| Pricing model | byok | byok |
| Starts at | $0/mo | $0/mo |
| Free tier | Yes | Yes |
| Bring your own key | Yes | Yes |
| Openness | ||
| Open source | Yes | Yes |
| License | Apache-2.0 | MIT |
| GitHub stars | 1,365 | 220 |
Which one would each critic pick
| Critic | Chidori | Legion | Pick |
|---|---|---|---|
| El Juez | — | — | not enough reviews |
| El Amigo | 6.8 | 6.8 | no preference |
| El Crítico | 6.0 | 6.0 | no preference |
| El Profesor | 7.8 | 7.8 | no preference |
| La Inversora | 5.3 | 6.3 | Legion — 166 stars and a consultancy's name on it. Software Mansion builds open libraries to sell engineering time, which funds this exactly as long as the pitch still works. |
| La Jefa | 6.3 | 5.5 | Chidori — Free for sixty engineers, and a committed checkpoint runs as a pipeline check with no model spend, which is the first agent test I could afford on every commit. |
| El Hacker | 7.5 | 6.8 | Chidori — Apache-2.0, a single binary with no runtime to install, and an environment variable points it at Ollama, vLLM or anything else speaking the common API. |
Picks are derived from each critic's own scores. Humans vote on matchups on the duels page.