Opus 4.8
Claude Opus 4.8 API with pay-as-you-go pricing
Get Claude Opus 4.8 API access with separate `sk-cs3-*` keys, a dedicated USD balance, Anthropic-compatible `/v1/messages`, and pricing optimized for long consistent coding sessions.
Official Opus 4.8 facts
Official Anthropic API model ID: claude-opus-4-8.
Anthropic positions Opus 4.8 as its frontier model for coding, agentic tasks, and long-running professional work.
Official context window: 1M tokens.
Official regular pricing: $5 / MTok input and $25 / MTok output. Fast mode pricing: $10 / MTok input and $50 / MTok output.
Available through the Claude API, AWS, GCP, and Microsoft Foundry.
Up to 70% discount
Savings depend on session consistency, workload shape, and cache reuse. The most stable long-running sessions benefit the most.
What this rail is best for
Long coding sessions in Cursor, Claude Code, and VS Code agents.
High-consistency multi-turn workflows where cache reuse compounds.
Teams that want a separate Opus 4.8 rail without mixing balances.
Next step
Opus 4.8 pricing
Top up a separate Opus 4.8 USD balance. Dashboard purchase stays separate from your current API3 balance.
Integrations and use cases
Key format
API base: anthropic1.claudestore.store
Public model: claude-opus-4-8
Key family: sk-cs3-*
Frequently asked questions
What is Claude Opus 4.8 best for?
Opus 4.8 is best for difficult coding, long-running AI agents, code migrations, and high-autonomy tasks where consistency matters more than raw speed.
How does the up to 70% discount work?
The discount is workload-dependent. Stable sessions with high consistency and strong cache reuse benefit the most; short inconsistent sessions save less.
Do I need a separate API key?
Yes. Opus 4.8 uses separate `sk-cs3-*` keys and a separate USD balance, so it never spends your current `sk-cs2-*` balance.