Claude Opus 5.5
Anthropic
- Context window
- 1M 1,000,000 tokens
- Max output
- 128K 128,000 tokens
- Input / Output
- text, image → text
API pricing
USD / 1M tokens
| Input | Output | Cached input |
|---|---|---|
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Timeline
- · Released · evidence link
- · Official announcement · evidence link
Input / output price · USD / 1M tokens
- · Evidence links · Anthropic · official articles
Excerpt
For longer analysis, switch to Opus 5.5
- · Evidence links · Anthropic · official articles
Excerpt
This post will dive into the mechanics of what makes Opus 5.5 cost effective for how developers are coding today (and likely tomorrow)
- · Evidence links · Anthropic · official articles
- · Evidence links · Anthropic · official articles
- · Evidence links · Anthropic · official articles
- · Alex's posts · Alex Getman
Excerpt
Fable 5.2 beats Opus 5.5 in nearly every benchmark
- · Alex's posts · Alex Getman
Excerpt
Kimi K3.1 Pro benchmarks are out! Of all these benchmarks, I trust Terminal-Bench 4.0 the most. And the results are impressive: Kimi K3.1 Pro scores 65.7, just 0.7 points behind the leader, Opus 5.5, while outperforming GPT-6 Astra by 7.5 points.
- · Evidence links · Anthropic · SDK releases
Excerpt
Fast mode is out of research preview for Claude Opus 5.5, and you no longer need to request access
- · Alex's posts · Alex Getman
Excerpt
Meta just released Muse Wonder According to the benchmarks, it's right up there with GPT 6 Astra and Claude Opus 5.5. The results look impressive, but the model might be heavily optimized for benchmarks. It's still unclear how well it actually performs in real world use. And yeah, most of you probably won't be able to try it through a subscription, since Muse is still only available in the US.
- · Alex's posts · Alex Getman
Excerpt
🚨 Gemini 4 Argon sits almost right on the Pareto frontier for price vs intelligence, next to Claude Opus 5.5 Medium and High
- · Alex's posts · Alex Getman
Excerpt
Sonnet 5.5 Max even beats Opus 5.5 Max on Terminal-Bench, while staying close to Opus across the rest. And against GPT Sol, the price/performance gap looks pretty brutal.
- · Alex's posts · Alex Getman
Excerpt
🚨 Sonnet 5.5 benchmarks are out It crushes Sonnet 5, goes toe-to-toe with Opus 5.5, and beats GPT-6 Sol across most shared benchmarks.
- · Alex's posts · Alex Getman
Excerpt
Claude Opus 5.5 owns almost the entire Pareto frontier
- · Alex's posts · Alex Getman
Excerpt
Opus 5.5 scores 58 points and takes the top spot in the AA Intelligence Index
- · Alex's posts · Alex Getman
Excerpt
Opus 5.5 is much cheaper than Opus 5
- · Alex's posts · Alex Getman
Excerpt
Opus 5.5 beats Fable and Astra
- · Alex's posts · Alex Getman
Excerpt
🚨 Claude Opus 5.5 is out!
- · Alex's posts · Alex Getman
Excerpt
🚨 New Claude Opus drops early next week It will likely be called Opus 5.5 $4/$20 input/output pricing, 20% cheaper than Opus 5
Evidence links
- · Catalogue listing · Anthropic API ·
claude-opus-5-5
Alex's take
Alex · “🚨 Claude Opus 5.5 is out!”
Signals 2
Alex's posts 4
Specifications
Claude Opus 5.5 is a model from Anthropic, released on 22 Sep 2026. The context window is 1,000,000 tokens. The maximum output is 128,000 tokens. Pricing is $4.00 per million input tokens and $20.00 per million output tokens.
- Context window
- 1,000,000
- Max output
- 128,000
- Input
- text · image
- Output
- text
- Input · USD / 1M tokens
- $4.00
- Output · USD / 1M tokens
- $20.00
- Cached input · USD / 1M tokens
- $0.20
Questions
What is the context window of Claude Opus 5.5?
The context window is 1,000,000 tokens. The maximum output is 128,000 tokens.
How much does Claude Opus 5.5 cost?
Pricing is $4.00 per million input tokens and $20.00 per million output tokens. Cached input is $0.20 per million.
When was Claude Opus 5.5 released?
On 22 Sep 2026.