Updated August 2026
Claude Opus 5 API Access in 2026
Claude Opus 5 is Anthropic's most capable model for deep reasoning, agentic coding, long-horizon tasks, and enterprise work. Through Claude API Tech, Opus 5 is available without a separate subscription.
One key, all models
A sk-cs2-* key gives access to Opus 5, Fable 5, Opus 4.8, Sonnet 5, and every other supported model. Switch models by changing the model parameter — no new key required.
Available models
| Model | Input | Output | Context |
|---|---|---|---|
NEWClaude Fable 5 | $5.00 / 1M | $25.00 / 1M | 200K |
NEWClaude Opus 5 | $2.50 / 1M | $12.50 / 1M | 1M |
OPUSClaude Opus 4.8 | $2.50 / 1M | $12.50 / 1M | 200K |
OPUSClaude Opus 4.7 | $2.50 / 1M | $12.50 / 1M | 200K |
OPUSClaude Opus 4.6 | $2.50 / 1M | $12.50 / 1M | 200K |
OPUSClaude Opus 4.5 | $2.50 / 1M | $12.50 / 1M | 200K |
NEWClaude Sonnet 5 | $1.00 / 1M | $5.00 / 1M | 200K |
FASTClaude Sonnet 4.6 | $1.50 / 1M | $7.50 / 1M | 200K |
FASTClaude Sonnet 4.5 | $1.50 / 1M | $7.50 / 1M | 200K |
Claude Opus 5 — specifications
Context window
1,000,000 tokens
Max output
128,000 tokens
Input
$2.50 / 1M tokens
Output
$12.50 / 1M tokens
Extended Thinking
Supported
API formats
Anthropic + OpenAI-compat
Streaming
SSE supported
Best use cases
- →Complex architecture and code review
- →Long document analysis (1M context)
- →Premium reasoning and research
- →Extended Thinking for multi-step problems
- →Production AI agents with deep reasoning
About pricing
At Claude API Tech you pay for Anthropic-equivalent tokens at up to −50% vs official. Tokens never expire. No monthly fee.
Access Opus 5 API$0.25 bonus on signup · No card required