LLM APIs · Comparison
Anthropic API (Claude) vs OpenAI API
2 products compared side by side: what you pay for with each one first, then the five access facts, entry prices, recorded plan limits and the bottom line of each review. The evidence note under the table says how each product was checked.
Side by side
| Metric | Anthropic API (Claude) | OpenAI API |
|---|---|---|
| What you're paying for | Worth the priceClaude models from Haiku 5.5 at $0.10 / $0.50 per 1M tokens up to Fable 5.1, with no training on API data and a BAA you can sign in the console. | Saves engineering timeOne API key for OpenAI's GPT-6 models and hosted tools, priced per token with published batch, flex and caching discounts. |
| Overall score | 7.2Best | 7.1 |
| Free option | Free trial | –Not measured |
| Card to start | –Not measured | –Not measured |
| Getting access | Self-serve | Self-serve |
| Starter priceCheapest paid plan | $0.10/1M input tokens | $0.10/1M input tokens |
| Pricing model | Usage-based | Usage-based |
| Pricing page | Public prices | Public prices |
| How you pay | Prepaid credits by card, expire after 1 year; invoicing through sales | Prepaid credits ($5 minimum), expire after 1 year |
| Free option | One-time free credits for new users, amount not stated | No free allowance stated |
| Reference scenario (100M in + 20M out tokens/mo) | $20 on claude-haiku-5-5, computed | $20 on gpt-6-luna, computed |
| Batch, cache and other discounts | Batch 50% off; cache hits 90% off on Haiku 5.5 | Batch and Flex 50% off; cached input 90% off |
| Trained on API data | No (Commercial Terms) | No, unless you opt in |
| Default retention | Deleted within 30 days | Abuse logs up to 30 days |
| Zero data retention | By agreement, through sales | By approval, through sales |
| SOC 2 / ISO 27001 | Both, listed for the API | Both, covering the API |
| HIPAA BAA | Standard BAA signed in the Console, if eligible | Standard BAA accepted in the API Platform, if eligible |
| Data regions | US-only inference at 1.1x; otherwise global | 10 storage regions by approval; processing in US, EU, UAE |
| Official SDKs | Python, TypeScript, C#, Go, Java, PHP, Ruby | Python, TypeScript/JavaScript, Java (beta), Go (beta), C#, Ruby |
| Console SSO | Through sales | Custom/Enterprise billing plan |
| Bottom line | From its public pages, the Anthropic API has a complete per-token price list, discounts that combine and strong data terms, with a self-serve HIPAA BAA. Region choice is US only, zero data retention and SSO go through sales, and a few pages disagree on billing details. | From its public pages, the OpenAI API has a complete per-token price list, published batch, flex and caching discounts, and audit reports that cover the API. Stricter data controls, residency and SSO go through sales, and a few docs pages lag behind the price list. |
Evidence: Anthropic API (Claude): facts checked 2026-10-15 from its public sign-up and pricing pages, no completed hands-on run; OpenAI API: facts checked 2026-10-15 from its public sign-up and pricing pages, no completed hands-on run. Prices in USD as listed, excluding tax. "–" means not recorded.
When to pick each
In the words of each review, with the date its facts were checked.
From our Anthropic API (Claude) review
Checked Oct 15, 2026- Pick Anthropic API (Claude) when
- You want one-time free credits for new users and an official PHP SDK, at the same $20 scenario price on Claude Haiku 5.5.
- Pick OpenAI API when
- You want data residency outside the US (by approval) or a flex rate at half price on top of the batch discount.
From our OpenAI API review
Checked Oct 15, 2026- Pick OpenAI API when
- You want data residency outside the US (by approval), and a flex rate at half price on top of the batch discount.
- Pick Anthropic API (Claude) when
- You want one-time free credits for new users and an official PHP SDK, at the same $20 scenario price on Claude Haiku 5.5.
Entry price
Baseline: each product's cheapest paid plan, per month. Included usage differs, so read the line under each price.
- Anthropic API (Claude)Claude Haiku 5.5$0.10/1M input tokens$0.50 per 1M output tokens for prompts up to 100,000 tokens; $0.50 / $2.50 for longer prompts; cache hits $0.01
- 1M-token context window, 128K output
- Tool use and structured outputs
- Batch $0.05 / $0.25
- US-only inference at 1.1x
- OpenAI APIGPT-6 Luna$0.10/1M input tokens$0.50 per 1M output tokens; cached input $0.01, cache writes $0.125; prompts over 272K input tokens cost 2x input and 1.5x output
- 1,050,000-token context window
- Batch and Flex at 50% of standard rates
- Fast mode at 2x
- EU data residency at +10%
Prices as listed on each pricing page, in USD per month, excluding tax. Observed: Anthropic API (Claude) 2026-10-15, OpenAI API 2026-10-15.
Which one fits
- If you need to start today without a sales call
- Anthropic API (Claude)Self-serve sign-up; the highest score of the 2 self-serve products here (7.2/10).
- Highest overall score
- Anthropic API (Claude)7.2/10 (Good). The review shows the score breakdown and the run behind it.
Picked by fixed rules from the table above, not by hand. How we score
Full reviews
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