Claude Opus 5 API Pricing: $5.00 / $25.00 per 1M Tokens
The numbers: Claude Opus 5 (Anthropic) bills $5.00 per 1M input tokens, $25.00 per 1M output tokens, and $0.50 per 1M cached input tokens, inside a 1M context window. On our reference 200-step agent workload that works out to about $6.73 per task.
Complex agentic coding and enterprise work; adaptive thinking and 128K maximum output. Every figure on this page was read directly from Anthropic’s own documentation on September 18, 2026 — not copied from a third-party comparison table. Rates change; the source link and check date below are part of the data.
Verified rates
| Item | Rate | Unit |
|---|---|---|
| Input | $5.00 | per 1M tokens |
| Output | $25.00 | per 1M tokens |
| Cached input (cache read) | $0.50 | per 1M tokens |
| Context window | 1M | tokens |
Source: Anthropic official pricing ↗, checked September 18, 2026.
What a real workload costs on Claude Opus 5
List rates are not bills. These two reference workloads translate the table above into money. The assumptions are visible so you can swap in your own trace — the cost calculator does exactly that.
Scenario A — one 200-step agent task
A coding agent runs 200 steps against a stable 40,000-token prefix (system prompt, tools, repository map). The prefix is written to cache on the first step, re-read on the remaining 199, and each step produces 500 output tokens. For Anthropic, cache writes bill at 1.25x the input rate.
| Component | Calculation | Cost |
|---|---|---|
| Cache write (once) | 40,000 tokens × $6.25 / 1M | $0.25 |
| Cache reads | 199 × 40,000 × $0.50 / 1M | $3.98 |
| Output | 200 × 500 × $25.00 / 1M | $2.50 |
| Total per task | $6.73 |
Scenario B — one heavy month
A production service pushes 50M fresh input tokens, 150M cached input tokens, and 10M output tokens through Claude Opus 5 in a month:
| Component | Volume | Cost |
|---|---|---|
| Fresh input | 50M × $5.00 | $250.00 |
| Cached input | 150M × $0.50 | $75.00 |
| Output | 10M × $25.00 | $250.00 |
| Monthly total | $575.00 |
Head-to-head cost comparisons
- Claude Opus 5 vs GPT-5.6 Sol — same workload, $6.73 vs $5.38 (1.3x apart).
Frequently asked questions
How much does Claude Opus 5 cost per million tokens?
Claude Opus 5 costs $5.00 per 1M input tokens and $25.00 per 1M output tokens, with cached input at $0.50 per 1M. Verified September 18, 2026 against Anthropic's official pricing.
What is the context window of Claude Opus 5?
Claude Opus 5 supports a 1M token context window, per Anthropic's documentation checked September 18, 2026.
Does Claude Opus 5 support prompt caching?
Yes. Cached input tokens bill at $0.50 per 1M instead of the full input rate; cache writes bill at 1.25x the input rate.
When was this Claude Opus 5 price last checked?
On September 18, 2026, against Anthropic's own pricing page: https://platform.claude.com/docs/en/about-claude/pricing