Claude Opus 5.5 pricing
Claude Opus 5.5 API cost from Anthropic — $4.00 per 1M input tokens and $20.00 per 1M output tokens. Standard rates across 1M context; Fast costs 2× and cannot combine with Batch. Estimate your real monthly bill below, then compare it against every other model.
Flagship 1M context · all prices USD per 1M tokens, this price verified 2026-10-08.
Cache writes: $5.00 / 1M tokens. Batch: 50% of Standard. Fast mode: 2× the applicable rate.
Claude Opus 5.5 capabilities & limits
Representative specs for this tier — confirm exact limits in the Anthropic docs.
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Call Claude Opus 5.5 from your code
The exact model string and endpoint to use. Uses the Anthropic API format.
claude-opus-5-5https://api.anthropic.com/v1ANTHROPIC_API_KEYcurl https://api.anthropic.com/v1/messages \
-H "x-api-key: $ANTHROPIC_API_KEY" \
-H "anthropic-version: 2023-06-01" \
-H "content-type: application/json" \
-d '{
"model": "claude-opus-5-5",
"max_tokens": 1024,
"messages": [{"role": "user", "content": "Hello"}]
}'Model strings follow each provider's naming convention; confirm the current id in the Anthropic docs before relying on it.
What a Claude Opus 5.5 API call actually costs
Blended input + output cost at Claude Opus 5.5's list rates — useful yardsticks before you commit to volume.
Claude Opus 5.5 cost calculator
Enter your monthly volume to estimate the Claude Opus 5.5 bill. Runs entirely in your browser.
Cache-write, Batch and Fast-mode adjustments are not included. Enter billable output, including thinking tokens. For the multi-model breakdown with the same exclusions, use the cost calculator.
Anthropic models — Claude Opus 5.5 in context
How Claude Opus 5.5 prices against its siblings. Cheapest reference cost first.
| Model | Input /1M | Output /1M | Cost / call* | Context | Type |
|---|---|---|---|---|---|
| Claude Haiku 5.5 Prompts up to 100K; above 100K, all token rates are 5× higher | $0.100 | $0.500 | $0.0006 | 1M | Fast / cheap |
| Claude Haiku 4.5 Fastest, near-frontier | $1.00 | $5.00 | $0.0060 | 200K | Fast / cheap |
| Claude Sonnet 5.5 Standard rates across 1M context; 5-minute and 1-hour cache writes billed separately | $2.00 | $10.00 | $0.012 | 1M | Balanced |
| Claude Sonnet 4.6 Best speed/intelligence; caching cuts input ~90% | $3.00 | $15.00 | $0.018 | 1M | Balanced |
| Claude Opus 5.5 Standard rates across 1M context; Fast costs 2× and cannot combine with Batch | $4.00 | $20.00 | $0.024 | 1M | Flagship |
| Claude Opus 4.8 Top Opus reasoning/agentic | $5.00 | $25.00 | $0.030 | 1M | Flagship |
| Claude Fable 5.1 Standard rates across 1M context; cache writes billed separately | $10.00 | $50.00 | $0.060 | 1M | Flagship |
| Claude Fable 5 Most capable widely released | $10.00 | $50.00 | $0.060 | 1M | Flagship |
*Reference cost of one call with 1,000 input + 1,000 output tokens — a neutral yardstick. Use the calculator for your real usage. Cheapest row highlighted.
How Claude Opus 5.5 pricing works
Claude Opus 5.5 is billed per token: a lower input price of $4.00 per million tokens for everything you send, and a higher output price of $20.00 per million for everything the model generates. To turn that into a real Claude Opus 5.5 bill, multiply by your monthly request volume and average prompt/response length — the calculator above does exactly that.
Prompt caching is the biggest lever on your Claude Opus 5.5 cost: cached input tokens bill at just $0.200 per million — about 95% cheaper. If you reuse a long system prompt or context across calls, caching can dramatically cut the input portion of your bill.
List prices move fast — always confirm the current numbers on the official Anthropic pricing page before relying on them for budgeting.
Claude Opus 5.5 pricing FAQ
How much does the Claude Opus 5.5 API cost?
Claude Opus 5.5 costs $4.00 per 1M input tokens and $20.00 per 1M output tokens, with cached input at $0.200 per 1M (about 95% off). A typical 3K-input / 500-output call at the displayed rate works out to about $0.022.
What is Claude Opus 5.5's context window?
Claude Opus 5.5 has a 1M-token context window. Standard uncached input is $4.00 per 1M tokens.
Does Claude Opus 5.5 support prompt caching?
Yes. At Standard rates, Claude Opus 5.5 bills cache-read tokens at $0.200 per 1M instead of $4.00 uncached — roughly 95% cheaper for the repeated part of your prompts.
Is there a cheaper alternative to Claude Opus 5.5?
In the same flagship tier, MiniMax-M3 (MiniMax) is cheaper at $0.300 in / $1.20 out. For the 1K-input / 1K-output reference workload, the lowest-cost model tracked in this catalog is Gemini 1.5 Flash-8B.