Why Claude?
Claude (Anthropic) has become a serious contender. Anthropic Claude is the benchmark for safety-aligned AI. Haiku offers the best price-performance ratio. Through AI24X, access Claude Opus 4, Sonnet, Haiku alongside DeepSeek, Qwen, GPT-6 and more through one API key.
Pricing Overview
from $0.25/M input tokens (Haiku), from $1.25/M output tokens (Haiku). Input (what you send) and output (what the model returns) are metered separately, and the larger Claude tiers cost more than Haiku, so the model id you pick matters as much as the workload. Through AI24X, get managed credits at competitive rates or bring your own key. Rates shown on the pricing page are the current published prices — check there before budgeting a workload, since model prices can change.
Best for complex reasoning, safety-critical apps, document analysis
Claude (Anthropic) excels at complex reasoning, safety-critical apps, document analysis. Teams using OpenAI SDK can switch by changing just the base URL.
Payment and signup from outside China
Depending on your region and payment method, direct access to some model providers is simply not available — a constraint that hits Anthropic and Chinese providers alike. AI24X sidesteps it: create an account, top up AI Gateway credits with PayPal or an international card, and call Claude through the same OpenAI-compatible interface. If you already hold Anthropic keys, the BYOK gateway keeps them in play too.
Choosing between Haiku, Sonnet and Opus
The Claude tiers trade cost against capability. A practical split: route high-volume, well-scoped tasks (classification, extraction, short summaries) to Haiku; give Sonnet the everyday production work; reserve Opus for the hardest reasoning and long-document analysis where its quality justifies the rate. Because AI24X exposes all of them through one key, you can change the model id per request and measure the difference on your own workload instead of guessing.
Migrating an existing codebase
Switching from an OpenAI-compatible setup is a two-line change: point base_url at https://api.ai24x.com/v1 and set the model id to the Claude tier you want. Requests keep the same JSON shape, so streaming and tool-calling code needs no rewrite. Run one smoke test before moving real traffic — the curl quickstart and OpenAI SDK guide walk through the first call and the settings that matter.
Common errors and fixes
- 401 Unauthorized — the key is wrong, truncated, or from another account. Re-paste the full key.
- 402 Payment Required — your AI Gateway credits balance has run out. Top up in the console and retry.
- 404 on the endpoint — the base URL must end at
/v1. Check the path segment is not missing. - Model not found — confirm the exact model id on the named models list.
Getting started
- Sign up free
- Get an API key
- Set
base_urltohttps://api.ai24x.com/v1 - Start calling Claude Opus 4 and other models
Compare with DeepSeek, other alternatives, and pricing comparison.
FAQ
Do I need an Anthropic account?
No. One AI24X key covers Claude Opus 4, Sonnet, Haiku and the rest of the catalog, with billing and usage managed in one console.
Can I pay with PayPal?
Yes. AI24X accepts PayPal and international cards, so you can use Claude even where direct payment to the provider is not an option.
Where do I check the current price?
Prices are configured in the platform and shown in the user console; the pricing page reflects the current published rates. Check there before budgeting a workload, since published rates can change.