Grammarly vs OpenAI: Pricing Comparison 2026
Side-by-side pricing comparison of Grammarly and OpenAI. See all plans, features, and costs at a glance.
Bottom line: Grammarly starts at Custom pricing and OpenAI starts at $0.2/mo. Compare all 17 pricing tiers side by side.
Last updated: March 16, 2026
Grammarly vs OpenAI: Quick Pricing Facts
| Feature | Grammarly | OpenAI |
|---|---|---|
| Starting Price | Custom pricing | $0.2/mo |
| Number of Plans | 3 | 14 |
| Free Tier | Yes | No |
| Pricing Model | freemium | usage-based |
| Annual Discount | N/A | N/A |
Grammarly and OpenAI are both priced at Custom pricing, making them equally accessible AI & ML tools. Together they offer 17 pricing plans with 0 features compared, so the best choice comes down to which features match your needs.
Grammarly stands out with a free plan for getting started. Grammarly uses freemium pricing while OpenAI uses usage-based pricing, which may affect your total cost at scale.
Review the detailed tier-by-tier comparison above to see exactly which features are included at each price point and find the best fit for your AI & ML needs.
| Pricing Plans |  Grammarly Try it free |  OpenAI Try it free |
|---|---|---|
| Tier 1 | FreePopular $0/monthCheapest | GPT-5.4 $3/month |
| Tier 2 | ProPopular Custom pricing | GPT-5 mini $0/monthCheapest |
| Tier 3 | EnterprisePopular Custom pricing | GPT-4.1 $3/monthCheapest |
| Tier 4 | — | GPT-4.1 mini $1/monthCheapest |
| Tier 5 | — | GPT-4.1 nano $0/monthCheapest |
| Tier 6 | — | o4-mini $4/monthCheapest |
| Tier 7 | — | Realtime API $2/monthCheapest |
| Tier 8 | — | Sora Video API Custom pricing |
| Tier 9 | — | Image Generation API $2/monthCheapest |
| Tier 10 | — | Responses API Custom pricing |
| Tier 11 | — | Chat Completions API Custom pricing |
| Tier 12 | — | Assistants API Custom pricing |
| Tier 13 | — | Built-in tools Custom pricing |
| Tier 14 | — | AgentKit Custom pricing |
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What Reviewers Say
Grammarly
Grammarly offers a free plan.
Based on pricing data only. Review the full comparison below for your specific needs.
Best value: Grammarly
Try Grammarly freeWhich Should You Choose?
Choose Grammarly if:
- •You need a free plan with core features—Grammarly offers no-cost access with no credit card required
- •You prioritize Grammarly's user experience and interface over price (both tools are similarly priced)
- •Grammarly's 3-tier freemium structure gives clearer cost visibility for budget planning
Choose OpenAI if:
- •You need 14 pricing tiers for flexible team sizing—more options mean less overpaying for features you don't need
- •You prioritize OpenAI's user experience and interface over price (both tools are similarly priced)
- •OpenAI's usage-based pricing lets you match exact team size without tier gaps
Grammarly offers a free plan [1], eliminating the cost barrier for evaluation, while OpenAI requires paid subscription from the start. This gives Grammarly a significant advantage for teams with budget constraints or extended trial periods. Once you outgrow Grammarly's free tier, upgrading to a paid plan at approximately Free provides substantial additional functionality. Compare this pricing path against OpenAI's tiering starting at $0.2/mo to assess total cost of ownership over 12 months. Grammarly's 3 tiers provide flexibility at different budgets, while OpenAI's 14 tiers structure may force you into higher-cost plans than necessary for your use case. If evaluation cost matters to your decision, Grammarly is the obvious starting point with zero financial commitment. Use the free tier to validate core functionality before committing to paid plans from either tool.
Frequently Asked Questions: Grammarly vs OpenAI
How many pricing plans does Grammarly have vs OpenAI?
Does Grammarly or OpenAI offer a free plan?
What is the most popular Grammarly plan?
Does Grammarly or OpenAI offer custom enterprise pricing?
What pricing models do Grammarly and OpenAI use?
How do Grammarly and OpenAI compare for AI & ML?
Sources
- Grammarly Official Pricing— Vendor pricing page
- OpenAI Official Pricing— Vendor pricing page
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