Claude Opus 4.8 and Claude Sonnet 5 are now available through the Amanai API - Anthropic's newest Opus and Sonnet models, each priced identically to the rest of its tier.
What changed
Two new public model IDs are available anywhere Amanai models can be selected: amanai/claude-opus-4.8 and amanai/claude-sonnet-5. Existing API keys and OpenAI-compatible request formats continue to work without configuration changes.
Capabilities
Claude Opus 4.8 supports deep multi-step reasoning, agentic coding, tool calling, vision, streaming responses, and prompt caching. It carries a 1M-token context window and is available through the same Chat Completions, Messages, and Responses interfaces used by the rest of the Amanai catalog.
Opus 4.8 supports up to 1M tokens of context. Actual usable context depends on request structure, output allowance, and upstream availability.
Using the new models
Set the request model to amanai/claude-opus-4.8 or amanai/claude-sonnet-5:
curl https://api.amanai.sh/v1/chat/completions -H "Authorization: Bearer $AMANAI_API_KEY" -H "Content-Type: application/json" -d '{"model": "amanai/claude-opus-4.8","messages":[{"role": "user","content": "Hello"}]}'curl https://api.amanai.sh/v1/chat/completions -H "Authorization: Bearer $AMANAI_API_KEY" -H "Content-Type: application/json" -d '{"model": "amanai/claude-sonnet-5","messages":[{"role": "user","content": "Hello"}]}'Pricing
Both models use Pricing Engine v2, each matching the rest of its tier - Opus 4.8 shares the Opus rate set, Sonnet 5 shares the Sonnet rate set.
Limited-time promotion: The entire Claude family is currently 20% off (80% of standard v2 pricing). The discounted multipliers below are live now across all Claude models. No code or enrollment needed.
| Model | Component | Before (v2) | Now (20% off) |
|---|---|---|---|
| Claude Opus 4.8 / 4.7 / 4.6 | Input | 22.64625 | 18.117 |
| Output | 113.23125 | 90.585 | |
| Cached input | 1.132313 | 0.90585 | |
| Claude Sonnet 5 / 4.6 | Input | 15.0975 | 12.078 |
| Output | 75.4875 | 60.39 | |
| Cached input | 0.754875 | 0.6039 | |
| Claude Haiku 4.5 | Input | 6.8625 | 5.49 |
| Output | 34.3125 | 27.45 | |
| Cached input | 0.343125 | 0.2745 |
This is a catalog addition and does not retroactively alter prior usage or rewrite the historical Pricing Engine v2 launch.
Availability & routing
Both Opus 4.8 and Sonnet 5 are served through Amanai's standard Claude routing, with automatic fallback across the available Claude backends so a single degraded path does not interrupt requests.
The model appears automatically in the model API, dashboard calculator, documentation, status page, Codex setup, and Coding CLI model picker. No new API key is required.