Best Free Models for Claude Code — Run It Through OpenRouter

The best free model to run Claude Code with is qwen/qwen3-coder:free on OpenRouter, a 1-million-token coding model that costs nothing and handles the tool-calling loop Claude Code depends on. There is an important honesty caveat first: Claude Code natively runs Anthropic's Claude models (Opus, Sonnet, Haiku), which are not free — they require a paid Claude Pro or Max subscription, or Anthropic API credits. So "free models for Claude Code" really means pointing Claude Code, or a compatible fork like OpenClaude, at OpenRouter's free model tier through a translating proxy.

As of July 2026, OpenRouter lists 23 genuinely free models (their IDs end in :free), rate-limited to 20 requests per minute and 50 requests per day, rising to 1,000 requests per day after a one-time $10 credit purchase. This guide ranks the free models that pair best with Claude Code's agentic workflow and shows exactly how to wire them up.

The Honest Situation: Claude Code and Free Models

Claude Code is Anthropic's official terminal coding agent, and it is hard-wired to Anthropic's Claude models by default. There is no free Claude model tier inside Claude Code — using it means either a Claude Pro/Max subscription or pay-as-you-go Anthropic API credits. If your goal is zero API cost, you cannot get there with Claude Code's default configuration.

The workaround exists because Claude Code respects two environment variables: ANTHROPIC_BASE_URL and ANTHROPIC_AUTH_TOKEN. Point ANTHROPIC_BASE_URL at a local proxy that speaks the Anthropic Messages format on one side and calls OpenRouter on the other, and Claude Code will happily send its agent traffic to a free model. The community project claude-code-router does exactly this translation, and OpenRouter documents the pattern in its own Claude Code integration guide.

The tradeoff is real: free open models do not match Anthropic's Opus or Sonnet on complex multi-file refactors, and Claude Code's harness was tuned against Claude's tool-calling behavior. Expect more retries and the occasional malformed edit. For learning, small tasks, and cost-sensitive background work, free routing is genuinely useful. For production-grade autonomous coding, see our best Claude models in 2026 comparison.

How to Run Claude Code With Free Models

There are two practical paths to running Claude Code style workflows on a free OpenRouter model: a translating proxy, or a fork that speaks OpenAI-compatible providers natively.

Path 1: claude-code-router (keep the Claude Code binary)

claude-code-router runs a local endpoint that Claude Code talks to as if it were Anthropic. You configure the router to forward requests to OpenRouter with your chosen free model, then start Claude Code with its base URL overridden.

# After installing and configuring claude-code-router to use
# openrouter with model qwen/qwen3-coder:free:
export ANTHROPIC_BASE_URL="http://localhost:3456"
export ANTHROPIC_AUTH_TOKEN="dummy-token"
export OPENROUTER_API_KEY="your-openrouter-key"

# Claude Code now routes through the free model
claude

For the full walkthrough of what the router does and when it is worth the extra layer, see our Claude Code Router guide.

Path 2: OpenClaude (a fork built for any provider)

OpenClaude is an open-source CLI forked from the Claude Code codebase that talks to OpenAI-compatible providers directly, so it needs no translation proxy.

# Install the fork
npm install -g @gitlawb/openclaude@latest

# Launch, then pick OpenRouter with /provider and paste your key
openclaude

# Inside the session: /provider -> OpenRouter
# Select model: qwen/qwen3-coder:free

Either path lands you on the same free models. The rankings below apply to both.

Best Free Models for Claude Code, Ranked

These are the free OpenRouter models best suited to Claude Code's agentic, tool-heavy loop, ranked for coding reliability. All model IDs are verbatim from the live OpenRouter models list as of July 2026; the free roster rotates, so confirm availability before you commit.

1. Qwen3-Coder — qwen/qwen3-coder:free

Maker: Qwen (Alibaba). Context: 1,048,576 tokens. Qwen3-Coder is a mixture-of-experts model purpose-built for software tasks, and it is the strongest free coder on OpenRouter. Its million-token window comfortably holds large repositories, and it handles the read-edit-run tool cycle Claude Code relies on. Point your router or OpenClaude at this ID first. Its limitation: on very long autonomous sessions it can drift on instruction adherence compared with a frontier paid model.

2. GPT-OSS 120B — openai/gpt-oss-120b:free

Maker: OpenAI (open-weight, Apache-2.0). Context: 131,072 tokens. GPT-OSS 120B produces the cleanest tool calls of the free bunch because it follows OpenAI's tool conventions, which reduces the malformed-edit problem in agent loops. Use it when your Claude Code workflow leans on structured tool use over raw context size. Limitation: its 131K window is small next to Qwen3-Coder for whole-repo tasks.

3. Nemotron 3 Super 120B — nvidia/nemotron-3-super-120b-a12b:free

Maker: NVIDIA. Context: 1,000,000 tokens. A 120B mixture-of-experts model with roughly 12B active parameters, Nemotron 3 Super pairs a million-token window with solid reasoning. It is a good long-context alternative when Qwen3-Coder is throttled. Limitation: it is a generalist, not a coding specialist, so it trails Qwen3-Coder on tight code-generation tasks.

4. Qwen3-Next 80B — qwen/qwen3-next-80b-a3b-instruct:free

Maker: Qwen (Alibaba). Context: 262,144 tokens. A fast MoE with about 3B active parameters, Qwen3-Next is snappy for interactive editing and follows instructions well. Use it as your default background model when you want responsiveness over maximum depth. Limitation: fewer active parameters means weaker performance on hard algorithmic reasoning.

5. Llama 3.3 70B Instruct — meta-llama/llama-3.3-70b-instruct:free

Maker: Meta. Context: 131,072 tokens. The most widely supported free open model, Llama 3.3 70B is a dependable all-rounder for explanation, refactoring, and boilerplate. Its ubiquity means Claude Code forks and routers handle it predictably. Limitation: it is now older than the Qwen and Nemotron entries and shows it on newer language features.

6. Gemma 4 31B — google/gemma-4-31b-it:free

Maker: Google. Context: 262,144 tokens. Gemma 4 31B is strong at following structured instructions, which suits Claude Code's system-prompt-heavy harness. It is a reasonable Google-family alternative for mid-size tasks. Limitation: coding depth trails the specialist models above, so reserve it for lighter edits and documentation work.

Comparison Table

Every model below is free on OpenRouter and shares the same tier limits: 20 requests per minute and 50 requests per day, rising to 1,000 per day after a one-time $10 credit purchase, per OpenRouter's rate-limit documentation.

For a broader ranking that spans every AI coding agent, not just Claude Code, see our hub post on the best free OpenRouter models for AI coding agents.

Limitations and When to Pay

Free routing is a genuine option for learning and light work, but it has hard edges you should know before you rely on it.

• Quality gap on hard tasks: Free open models trail Anthropic's Opus and Sonnet on complex multi-file refactors, long-horizon planning, and subtle debugging. Claude Code's harness is tuned to Claude's behavior, so third-party models produce more retries.
• Rate limits break autonomous loops: 20 requests per minute and 50 requests per day (before the $10 top-up) are easy to exhaust in a single agentic session that fires many tool calls.
• Extra moving parts: The proxy path adds a component to configure, authenticate, and debug. If your base setup is unstable, adding a router usually makes things worse before it makes them better.
• Reliability is best-effort: Free requests are deprioritized during peak traffic and can queue or return 429 errors. There is no SLA.

The pragmatic pattern: prototype and run low-stakes tasks on qwen/qwen3-coder:free, and switch back to a paid Claude model inside native Claude Code when a task genuinely needs frontier quality. For a fuller free-model landscape beyond OpenRouter, our best free AI models in 2026 guide covers local and other free options.

Related Guides

• Best Free OpenRouter Models for AI Coding Agents
• OpenRouter Free Models for OpenClaw: Best Picks + Rotation Strategy
• What Is OpenClaude? The Claude Code Fork That Runs Any Model
• Claude Code Router: What It Is and When It Is Worth Using
• Best Claude Models in 2026 — Sonnet vs Opus vs Haiku