Claude Opus 5.5 API pricing
Anthropic's high-end line for complex reasoning and agentic work. Claude Opus 5.5, released 22 September 2026, costs $4 / $20 per 1M tokens, 20% less than Opus 5.
Claude Opus 5.5 prices
What it costs in practice
Claude Opus 5.5 at list prices, no batch discount.
| 1,000 chat replies1,500 tokens in and 300 out each | $12.00 |
|---|---|
| Summarising 100 long reports20,000 tokens in and 800 out each | $9.60 |
| A month of a coding agent400 tasks, 85% of input cached | $738 |
The coding-agent example assumes 85% of input is served from cache, typical for agents that resend the same context each step. Model your own workload
Details
claude-opus-5-5- Fast mode costs $8 / $40 per 1M tokens on the Claude API.
- 20% cheaper than Claude Opus 5 on both input and output.
Checked 27 Sep 2026 against Anthropic pricing and TechCrunch, 22 Sep 2026 .
Other Claude Opus versions
Earlier Opus models (4.5 to 5) remain available at $5 / $25. Opus 4 and 4.1 were retired in 2026.
| Model | Input / 1M | Output / 1M | Cached input | Context | Released |
|---|---|---|---|---|---|
Claude Opus 5Previous |
$5.00 | $25.00 | $0.50 | 1M | 24 Jul 2026 |
Claude Opus 4.8Previous |
$5.00 | $25.00 | $0.50 | 1M | Jun 2026 |
Claude Opus 4.7Previous |
$5.00 | $25.00 | $0.50 | 1M | Apr 2026 |
Claude Opus 4.6Previous |
$5.00 | $25.00 | $0.50 | 1M | Feb 2026 |
Claude Opus 4.5Previous |
$5.00 | $25.00 | $0.50 | 200K | 24 Nov 2025 |
Version details
Claude Opus 5
Previous$5.00 / $25.00 per 1M tokenscached $0.50 · batch 50% off · 1M context · 128K max output
- Fast mode costs $10 / $50 per 1M tokens.
Newer option: Claude Opus 5.5 at $4.00 / $20.00. Checked 27 Sep 2026 against Anthropic pricing and Axios, 24 Jul 2026 .
Claude Opus 4.8
Previous$5.00 / $25.00 per 1M tokenscached $0.50 · batch 50% off · 1M context · 128K max output
Newer option: Claude Opus 5.5 at $4.00 / $20.00. Checked 27 Sep 2026 against Anthropic pricing .
Claude Opus 4.7
Previous$5.00 / $25.00 per 1M tokenscached $0.50 · batch 50% off · 1M context · 128K max output
- Anthropic says it will not retire this model before 16 April 2027.
Newer option: Claude Opus 5.5 at $4.00 / $20.00. Checked 27 Sep 2026 against Anthropic pricing and Anthropic model deprecations .
Claude Opus 4.6
Previous$5.00 / $25.00 per 1M tokenscached $0.50 · batch 50% off · 1M context · 128K max output
- Anthropic says it will not retire this model before 5 February 2027.
Newer option: Claude Opus 5.5 at $4.00 / $20.00. Checked 27 Sep 2026 against Anthropic pricing and Anthropic model deprecations .
Claude Opus 4.5
Previous$5.00 / $25.00 per 1M tokenscached $0.50 · batch 50% off · 200K context · 64K max output
Newer option: Claude Opus 5.5 at $4.00 / $20.00. Checked 27 Sep 2026 against Anthropic pricing .
Compare Claude Opus 5.5
Price history
All changesAnthropic pricing rules
- Batch requests cost 50% less.
- Cache reads are billed at a per-model rate, usually a tenth of the input price or less. Cache writes cost 1.25× input for the 5-minute cache and 2× for the 1-hour cache.
- The full 1M-token context window is billed at standard rates on current models.
Retired Claude Opus models
- Retired 5 Aug 2026Claude Opus 4.1 was $15.00 / $75.00 per 1M tokens. Use Claude Opus 5.5 instead.
- Retired 15 Jun 2026Claude Opus 4 was $15.00 / $75.00 per 1M tokens. Use Claude Opus 5.5 instead.
Questions
How much does Claude Opus 5.5 cost?
As of 27 Sep 2026, Claude Opus 5.5 costs $4 per million input tokens and $20 per million output tokens, and $0.20 per million cached input tokens. Batch requests cost 50% less. Prices checked 27 Sep 2026.
What is Claude Opus 5.5's context window?
1M tokens, with up to 128K tokens of output.
Does Claude Opus 5.5 support prompt caching?
Yes. Repeated input read from the cache costs $0.20 per million tokens, 95% less than normal input.