Hard facts side by side: free tiers, prices, limits, SDKs and privacy. Every value links to the official page it came from and is re-checked every week.
| Fact |  OpenAI |  Anthropic (Claude API) |  Google Gemini API |
|---|---|---|---|
| Free tier | Not listed | Trial credits New users receive a small amount of free credits to test the API. Source, Sep 29, 2026 | Yes Free of charge on Flash models (not Pro); free-tier content is used to improve products. Source, Sep 29, 2026 |
| Starting price | $2 per 1M input tokens GPT-6-Sol; $10 per 1M output tokens (GPT-6-Luna from $0.10 input). Source, Sep 29, 2026 |
| $2 per 1M input tokens Claude Sonnet 5.5; $10 per 1M output tokens (Haiku 4.5 from $1 input). Source, Sep 29, 2026 |
| $0.75 per 1M input tokens Gemini 3.8 Flash, $3.75 output; rises to $1.50/$7.50 on Jan 1, 2027. Source, Sep 29, 2026 |
| Rate limit | 500 requests/min Tier 1 ($5 paid), GPT-6-Sol; 500,000 tokens/min. Source, Sep 29, 2026 | 1,000 requests/min Start tier, Claude Sonnet 5.5 (2M input tokens/min); new orgs may start lower. Source, Sep 29, 2026 | Not listed |
|---|
| Size limit | 1.05M token context GPT-6 Astra, Sol and Luna. Source, Sep 29, 2026 | 1M token context Claude Fable 5.1, Opus 5.5 and Sonnet 5.5 (Haiku 4.5: 200K). Source, Sep 29, 2026 | 1M token context Gemini 3.8 Flash: 1,048,576 input tokens, 65,536 output tokens. Source, Sep 29, 2026 |
|---|
| Storage | 1 GB free File search storage, then $0.10 per GB per day. Source, Sep 29, 2026 | Not listed | Not listed |
|---|
| Official SDKs | PythonJavaScript / TypeScript.NETJavaGoRubySource, Sep 29, 2026 | PythonJavaScript / TypeScript | PythonJavaScript / TypeScript |
|---|
| Trains on your data | No API data is not used for training unless you explicitly opt in. Source, Sep 29, 2026 | No Inputs and outputs from the Anthropic API are not used for training by default. Source, Sep 29, 2026 | No Paid tier prompts and responses are not used to improve products; free tier data is. Source, Sep 29, 2026 |
|---|
| EU hosting | Yes Europe (EEA + Switzerland) data residency via eu.api.openai.com; requires approval. Source, Sep 29, 2026 | No Inference geo is only us or global; workspace (storage) geo is only us. Source, Sep 29, 2026 | Yes EU multi-region endpoints via Google Cloud (Gemini Enterprise Agent Platform), not AI Studio. Source, Sep 29, 2026 |
|---|
| Compliance | SOC 2ISO 27001GDPRHIPAASource, Sep 29, 2026 | SOC 2ISO 27001HIPAASource, Sep 29, 2026 | Not listed |
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