Claude Opus 5.5 Pricing — What It Costs and How It Compares
Anthropic's latest frontier model drops prices by 20% compared to its predecessor. Here is a complete breakdown of Claude Opus 5.5 API costs, subscription plans, and how it stacks up against GPT-6.
Quick Answer
Claude Opus 5.5 costs $4 per million input tokens and $20 per million output tokens via the API, marking a 20% decrease from Opus 5. Cache reads are $0.20 per million tokens. For end users, it requires a paid subscription (Pro, Max, Team, or Enterprise), with Anthropic raising the 5-hour usage limits at launch.
The New Opus 5.5 API Pricing
Released on September 22, 2026, Claude Opus 5.5 brings frontier-level intelligence with a noticeable price cut. Anthropic has priced the model at $4.00 per million input tokens and $20.00 per million output tokens.
This represents a substantial 20% discount compared to Claude Opus 5, which was priced at $5.00/$25.00. Anthropic is leveraging increased compute efficiency to bring costs down while maintaining Fable 5.1-level performance.
Additionally, prompt caching makes a return. Cache reads for Opus 5.5 cost just $0.20 per million tokens, allowing developers to inject massive system prompts, codebases, and RAG contexts for pennies, provided the cache remains hot.
Price Comparison: Opus 5.5 vs Competitors
The launch of Opus 5.5 coincided exactly with OpenAI's release of GPT-6 Sol and Luna, setting up an intense pricing war in the frontier AI space. Here is how the costs stack up per million tokens.
| Model | Input ($/MTok) | Output ($/MTok) | Cache Read | Notes |
|---|---|---|---|---|
| Claude Opus 5.5 | $4.00 | $20.00 | $0.20 | 20% cheaper than Opus 5 |
| Claude Opus 5 | $5.00 | $25.00 | $0.50 | Previous generation |
| GPT-6 Sol | $2.00 | $10.00 | N/A | Exactly half the price of Opus 5.5 |
| GPT-6 Luna | $0.10 | $0.50 | N/A | Ultra-fast, lowest cost tier |
| Grok 4.7 | $2.00 | $6.00 | N/A | xAI's competitive mid-tier offering |
While Opus 5.5 is cheaper than its predecessor, compared to GPT-6 Sol, it commands a 2x premium on input and output. The value of Opus 5.5 lies heavily in its superior reasoning capabilities and its ultra-cheap $0.20 cache read price, which can drastically flip the cost equation for highly repetitive, large-context workloads.
Fast Mode & US-Only Inference Rates
Beyond standard API usage, Anthropic has introduced specialized pricing tiers for developers with specific throughput or compliance needs:
- Fast Mode: Priced at $8.00 input / $40.00 output per million tokens. This mode guarantees premium compute priority, reducing time-to-first-token (TTFT) and accelerating generation speed, though it doubles the standard cost.
- US-Only Inference: For enterprise compliance, routing inference strictly through US-based servers incurs a 1.1x multiplier on standard rates, coming out to $4.40 input / $22.00 output per million tokens.
Real-World Cost-Per-Task Examples
To understand the practical implications of $4/$20 pricing, let's look at two standard developer scenarios.
Example 1: Comprehensive Code Review
Suppose you pass a 10,000-token codebase snippet (input) to Opus 5.5, and it generates a detailed 1,000-token review with refactored code (output).
- Input Cost: 10,000 tokens * ($4.00 / 1,000,000) = $0.04
- Output Cost: 1,000 tokens * ($20.00 / 1,000,000) = $0.02
- Total Task Cost: $0.06
Example 2: 50k-Token Document Analysis with Caching
You upload a 50,000-token legal document to the cache, then ask 10 separate questions, each generating a 500-token response.
- Initial Cache Write (Input): 50,000 tokens * ($4.00 / 1,000,000) = $0.20
- 10 Cache Reads: (10 * 50,000 tokens) * ($0.20 / 1,000,000) = $0.10
- 10 Question Prompts (Input): (10 * 100 tokens) * ($4.00 / 1,000,000) = $0.004
- 10 Outputs: (10 * 500 tokens) * ($20.00 / 1,000,000) = $0.10
- Total Task Cost: ~$0.40 (Compare this to $2.10 if cache wasn't used!)
Subscription Plans and Usage Limits
For non-API users, Claude Opus 5.5 is not available on the free tier. Anthropic requires a paid subscription to access the model via the web interface.
The model is available across the following plans:
- Claude Pro: The standard $20/month individual subscription.
- Claude Max: The premium tier with extended limits and priority features.
- Claude Team & Enterprise: Aimed at organizations needing higher bandwidth and centralized billing.
Crucially, to celebrate the launch of Opus 5.5, Anthropic raised the 5-hour usage limits across all these paid plans, allowing users to stretch the model's new adaptive thinking parameters further than before.
Frequently Asked Questions
How much does Claude Opus 5.5 cost?
Claude Opus 5.5 costs $4 per million input tokens and $20 per million output tokens via the API. Cache reads are $0.20 per million tokens.
Is Claude Opus 5.5 cheaper than Opus 5?
Yes, Opus 5.5 is 20% cheaper than Opus 5, dropping from $5/$25 to $4/$20 per million tokens.
Is Opus 5.5 cheaper than GPT-6?
No. GPT-6 Sol costs $2/$10 per million tokens, making it exactly half the price of Opus 5.5, while GPT-6 Luna is vastly cheaper at $0.10/$0.50.
How does prompt caching pricing work?
Prompt caching in Opus 5.5 allows you to reuse context. Cache reads cost only $0.20 per million tokens, offering massive savings for long contexts compared to the base $4 input cost.
Is there a free plan for Claude Opus 5.5?
No, Claude Opus 5.5 is not available on Anthropic's free tier. You need a Pro, Max, Team, or Enterprise subscription, or API access to use it.