Best AI coding plans under $20/month
The best-value AI coding and agent subscriptions you can get for $20 a month or less, ranked by how much API-equivalent compute each dollar unlocks.
Key facts
- Top pick: Z.ai GLM Coding Lite at $18/mo — Value× 6.7×, an estimated $120/mo of API-equivalent usage (as of August 28, 2026).
- Runner-up: opencode Zen Go at $10/mo (Value× 6.0×).
- 22 plans from 18 providers qualify for this budget.
| Provider | Plan | Price/mo | Est. value/mo | Value× | |
|---|---|---|---|---|---|
| Z.ai | GLM Coding Litebest value | $18 | $120 | 6.7× | See plan → |
| opencode | Zen Go | $10 | $60 | 6.0× | See plan → |
| Google Gemini | Google AI Pro | $19.99 | $110 | 5.5× | See plan → |
| OpenAI Codex | Plus | $20 | $110 | 5.5× | See plan → |
| Google Gemini | Google AI Plus | $4.99 | $25 | 5.0× | See plan → |
| OpenAI Codex | Go | $8 | $40 | 5.0× | See plan → |
| xAI Grok | SuperGrok Lite | $10 | $50 | 5.0× | See plan → |
| Mistral | Pro | $14.99 | $70 | 4.7× | See plan → |
| Claude | Pro | $20 | $90 | 4.5× | See plan → |
| Windsurf | Pro | $20 | $90 | 4.5× | See plan → |
| Amazon Q Developer | Pro | $19 | $85 | 4.5× | See plan → |
| Devin | Pro | $20 | $60 | 3.0× | See plan → |
| GitHub Copilot | Copilot Pro | $10 | $15 | 1.5× | See plan → |
| JetBrains AI | AI Pro | $8.33 | $10 | 1.2× | See plan → |
| Kimi | Moderato | $19 | $19 | 1.0× | See plan → |
| GitHub Copilot | Copilot Business | $19 | $19 | 1.0× | See plan → |
| Cursor | Pro | $20 | $20 | 1.0× | See plan → |
| Amp | Megawatt | $20 | $20 | 1.0× | See plan → |
| Replit | Core | $20 | $20 | 1.0× | See plan → |
| Xiaomi MiMo | Token Plan Standard | $16 | $15 | 1.0× | See plan → |
| Xiaomi MiMo | Token Plan Lite | $6 | $6 | 1.0× | See plan → |
| Zed | Pro | $10 | $5 | 0.5× | See plan → |
Compare every plan side by side →
Frequently asked questions
What is the best AI coding plan under $20/month?
As of August 28, 2026, the best-value pick is Z.ai GLM Coding Lite at $18/mo — an estimated $120/mo of API-equivalent usage (Value× 6.7×).
Which providers have plans in this budget?
As of August 28, 2026, this budget covers 22 plans from Z.ai, opencode, Google Gemini, OpenAI Codex, xAI Grok.
What does Value× mean?
Value× is the ratio of a plan's estimated API-equivalent monthly usage value to its monthly price — a Value× of 5× means the plan unlocks roughly $5 of pay-as-you-go compute for every $1 you pay.
How we rank these
Every plan is scored by Value× — an estimate of the API-equivalent compute you'd have to buy to match what the subscription includes, divided by its monthly price. A higher Value× means more model usage per dollar. We don't rank by price alone, because a cheaper plan with tight limits can be worse value than a slightly pricier one.
Other budgets
Best free AI coding & agent plans · Best AI coding plans under $50/month · Best AI coding plans under $100/month · Best AI coding plans under $200/month · Best AI coding plans over $200/month