AgentsOpen SourceFreeActiveMachine-verified· beginner · ~5 min setup

Hermes on MiMo-V2.5: a 1M-context agent for pennies

Set MiMo-V2.5 as your everyday Hermes model: 1M context at $0.14/$0.28 per 1M tokens, with tool-use enforcement on for a non-GPT model.

by Shilpa Mitra· verified today· v1.0.0

Run this workflow

CI-verified, 2/2 fixtures passing.

Build this with your agent

One copy-paste hands Claude Code, Codex, or Cursor the full recipe, steps included, nothing to fetch.

Intended Use

Anyone who wants a cheap, capable default model for general Hermes agent work. CI validates that config.yaml parses and points Hermes at openrouter + xiaomi/mimo-v2.5 with tool_use_enforcement on (MiMo is not on Hermes' auto-enforce list, so you set it yourself). No API key, no model call. The actual conversation is a model step and is fenced.

Not for

  • Tasks that need a frontier model's reasoning, this is the cheap-but-capable tier
  • Expecting CI to judge MiMo's output quality, that is the fenced model step

The Stack

Hermes Agentagent runtimeXiaomi MiMomodel (MiMo-V2.5)

Tested Against

hermes-agent docs (2026-06)openrouter xiaomi/mimo-v2.5ruby@3.x (YAML stdlib)

Side effects & data flow

Network
none, local only
Writes
./config.yaml
Credentials
none required

Prerequisites

  • Hermes Agent installed
  • An OpenRouter API key (only to actually run the agent)

Steps

  1. 1

    Point Hermes at MiMo-V2.5 and validate the config

    Write ~/.hermes/config.yaml so model.provider is openrouter and model.model is the xiaomi/mimo-v2.5 slug. MiMo is not on Hermes' tool-use auto-enforce list (gpt/codex/gemini/gemma/grok), so turn tool_use_enforcement on if it narrates instead of calling tools. CI loads this exact YAML with a real parser and asserts the slug, no key.

    cat > config.yaml <<'YAML'
model:
  provider: openrouter
  model: xiaomi/mimo-v2.5
agent:
  tool_use_enforcement: true
YAML
ruby -ryaml -e '
c = YAML.load_file("config.yaml")
m = c["model"] || {}
abort "BAD: provider not openrouter" unless m["provider"] == "openrouter"
abort "BAD: model not xiaomi/mimo-v2.5" unless m["model"] == "xiaomi/mimo-v2.5"
puts "config OK: openrouter -> xiaomi/mimo-v2.5 (config.yaml parses)"
'
  2. 2

    Run the agent (the model step, not checked by CI)

    Set OPENROUTER_API_KEY in ~/.hermes/.env and start Hermes. The conversation itself runs MiMo and costs per-token, so CI never claims it.

Eval, 2 fixtures

Last passed: verified today
  • config-okcontainstimeout 30s · max $0

    Expected: config OK: openrouter -> xiaomi/mimo-v2.5 (config.yaml parses)

  • clean-exitexit_codetimeout 30s · max $0

    Expected: 0

Results

MiMo-V2.5 scores ~49 on Artificial Analysis' Intelligence Index at $0.14 in / $0.28 out per 1M tokens (OpenRouter) with a 1M-token window: about as cheap as a capable default gets.

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