Anthropic
Claude Opus 5.5: price, context window and ranking
As of 18 October 2026, Claude Opus 5.5 from Anthropic costs $4.00 per million input tokens and $20.00 per million output tokens on OpenRouter, with a context window of 1M tokens. On the LMArena text leaderboard it ranks 2 with a score of 1,515.8. It is number 7 on OpenRouter by usage, with 3.6% of tokens in the past 7 days.
- Input price
- $4.00
- Output price
- $20.00
- Context window
- 1M
- LMArena score
- 1,515.8
- Usage share, 7 days
- 3.6%
- Providers
- 11
per 1M tokens
per 1M tokens
tokens
rank 2
rank 7
uptime 100.0%
Specifications
| Field | Value |
|---|---|
| Provider | Anthropic |
| Input price per 1M tokens | $4.00 |
| Output price per 1M tokens | $20.00 |
| Blended price per 1M tokens (3:1) | $8.00 |
| Context window | 1,000,000 |
| Providers serving it | 11 |
| Average uptime, past day | 100.0% |
| LMArena | 1,515.8 (rank 2) |
| Arena score per dollar | 189.5 |
| Usage share, 7 days | 3.6% (rank 7) |
| Added to OpenRouter | 2026-09-22 |
| Modality | text+image+file->text |
| OpenRouter model ID | anthropic/claude-opus-5.5 |
Price history
- Input
- Output
| Date | Input | Output |
|---|---|---|
| 2026-10-16 | $4.00 | $20.00 |
| 2026-10-17 | $4.00 | $20.00 |
| 2026-10-18 | $4.00 | $20.00 |
Usage rank history
- Usage rank
| Date | Usage rank |
|---|---|
| 2026-10-16 | 8 |
| 2026-10-17 | 8 |
| 2026-10-18 | 7 |
Compare with other models
Frequently asked questions
How much does Claude Opus 5.5 cost per million tokens?
Claude Opus 5.5 costs $4.00 per million input tokens and $20.00 per million output tokens on OpenRouter, as of 18 October 2026. At a mix of three parts input to one part output the blended price is $8.00 per million tokens.
What is the context window of Claude Opus 5.5?
Claude Opus 5.5 has a context window of 1M tokens (1,000,000 exactly).
How does Claude Opus 5.5 rank on LMArena?
Claude Opus 5.5 is ranked 2 on the LMArena text leaderboard with a score of 1,515.8 from 8,300 votes. The listing used is "Claude Opus 5.5 (High)".
When was Claude Opus 5.5 released?
OpenRouter lists Claude Opus 5.5 as added on 22 September 2026.
Who provides Claude Opus 5.5?
Claude Opus 5.5 is served by 11 providers on OpenRouter, with average uptime of 100.0% over the past day.
Methodology and sources
The catalogue, prices, context lengths and provider counts come from OpenRouter's public Models API. They are fetched every day at 06:00 Istanbul time and stored as a daily snapshot. Weekly changes are calculated by Oesnada by comparing those snapshots; there is no data before 16 October 2026.
Usage shares are calculated from the daily token totals of OpenRouter's Data API: a model's tokens over the past 7 days divided by all tokens in the same period, including the aggregated long tail outside the top 50. Token counts come from each provider's own tokenizer and are not directly comparable across providers. The data is published by OpenRouter under CC BY 4.0. Variants such as ":free" are counted separately, so shares here can differ from OpenRouter's own ranking page.
Quality rankings come from LMArena's text (overall) leaderboard. A model is matched only when its name matches exactly; if a model has several listings, the highest-scoring one is used. "Frontier" means a model in the LMArena top 15.
"Best value" divides the LMArena score by the blended price (three parts input to one part output). Arena scores are not a linear scale, so the ratio is a rough guide. This page is produced automatically.
- OpenRouter Models API
- OpenRouter Rankings (Data API) (CC BY 4.0)
- LMArena leaderboard dataset (CC BY 4.0)
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Cite this page
Oesnada, "Claude Opus 5.5: price, context window and ranking", https://oesnada.com/ai-models/anthropic-claude-opus-5-5, accessed 18 October 2026.