Aider Pricing Guide 2026
Aider is a free, open-source AI pair programming tool that works in your terminal. It supports over 100 models via LiteLLM, meaning you can choose any AI provider and pay only for what you use.
Visit Aider →Aider Pricing Plans
| Component | Cost | Details |
|---|---|---|
| Aider (open source) | Free | Terminal-based pair programming tool |
| Model API costs | Varies | Supports 100+ models via LiteLLM |
| Budget option | ~$0.01/session | Gemini 2.0 Flash or GPT-4o mini |
| Premium option | ~$0.50/session | Claude Sonnet 4 or GPT-4o |
Best AI Models for Aider (2026)
Based on cost-effectiveness, coding quality, and availability. Data updated Apr 18, 2026.
GPT-4o mini
OpenAI · $0.150/M input
High-volume tasks, simple coding, cost-sensitive projects
View full pricing →GPT-4o mini
OpenAI · $0.150/M input
High-volume tasks, simple coding, cost-sensitive projects
View full pricing →Claude 3 Sonnet
Anthropic · $3.00/M input
General-purpose coding and reasoning
View full pricing →Cost Per Session with Aider
Estimated cost for a medium feature implementation (100K input + 10K output tokens).
| Model | Provider | Cost/Session | Input Price | Output Price |
|---|---|---|---|---|
| Claude Sonnet 4 | Anthropic | $4.66 | $3.00/M | $15.00/M |
| Claude 3.5 Sonnet | Anthropic | $4.66 | $3.00/M | $15.00/M |
| Claude 3.5 Haiku | Anthropic | $1.24 | $0.800/M | $4.00/M |
| Claude 3 Sonnet | Anthropic | $4.05 | $3.00/M | $15.00/M |
| Claude 3 Haiku | Anthropic | $0.34 | $0.250/M | $1.25/M |
| GPT-4o | OpenAI | $3.06 | $2.50/M | $10.00/M |
Frequently Asked Questions
Is Aider free?
Yes, Aider is free and open source. You only pay for the AI model API you choose to use.
What's the cheapest model to use with Aider?
Gemini 2.0 Flash at $0.10/M input tokens or GPT-4o mini at $0.15/M input tokens. A typical session costs under $0.02.
Does Aider support Claude models?
Yes, Aider supports all major models including Claude Sonnet 4, Claude Opus 4, and the entire Claude family via API.
Compare Aider with Other Platforms
See how Aider stacks up against the competition.
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