Claude Opus 5.5 at a glance.
From Anthropic's own pages, read Oct 20, 2026, so company-reported. A token is a word or part of a word. Prices can change; check the maker's page before you build on them.
- Made by
- AnthropicBased in US
- Released
- Sep 22, 2026Anthropic: Claude Opus product page
- What it is for
- “For long-running agentic coding and knowledge work”Claude Platform docs: Models overview, Oct 20, 2026 · in Anthropic's words
- Reads at once
- 1M tokensIts context window: how much text it can take in one go
- Takes in
- text, image
- Download
- No, online only
$4per million tokens in$20per million tokens out
Prompt caching (5-minute TTL): cache read $0.20/MTok, cache write $5/MTok. Batch saves 50%. Fast mode: 'up to 2.5x faster speeds' at 2x standard pricing. US-only inference 1.1x. Product page: '$4 per million input tokens and $20 per million output tokens, 20% below Opus 5.'
Anthropic pricing page, Oct 20, 2026 · company-reported
Where it ranks.
Its position on each of the 21 tests the models page uses, by testers other than the maker. Epoch AI's and Vectara's scores are shown under their open licenses; for LMArena, Scale and Vals we give the position and link to their own leaderboard. Each list is a snapshot with its date.
| Test | Rank | Score |
|---|---|---|
| Epoch Capabilities IndexEpoch AI, Oct 20, 2026 | #1 | 166.8range 163.54 to 170.99 |
| Vals IndexVals AI, Oct 19, 2026 | #2 | On Vals AI |
| Test | Rank | Score |
|---|---|---|
| LMArena WebDevLMArena, Oct 19, 2026 | #1 | On LMArena |
| SWE-Bench ProScale AI, Sep 22, 2026 | Not in the top 16 | |
| Vibe Code BenchVals AI, Oct 18, 2026 | #5 | On Vals AI |
| LMArena coding chatsLMArena, Oct 15, 2026 | #6 | On LMArena |
| Test | Rank | Score |
|---|---|---|
| LMArena textLMArena, Oct 15, 2026 | #3 | On LMArena |
| LMArena creative writingLMArena, Oct 15, 2026 | #1 | On LMArena |
| MultiChallengeScale AI, Feb 3, 2026 | Not in the top 15 |
| Test | Rank | Score |
|---|---|---|
| LMArena Agent ArenaLMArena, Oct 19, 2026 | #1 | On LMArena |
| Remote Labor IndexScale AI | #1 | On Scale AI |
| Terminal-Bench 4.0Vals AI, Oct 19, 2026 | #1 | On Vals AI |
| CUA-bench (games)Vals AI, Oct 13, 2026 | #2 | On Vals AI |
| Test | Rank | Score |
|---|---|---|
| LMArena mathLMArena, Oct 15, 2026 | #14 | On LMArena |
| Humanity's Last ExamScale AI | #2 | On Scale AI |
| ProofBenchVals AI, Oct 12, 2026 | #2 | On Vals AI |
| Test | Rank | Score |
|---|---|---|
| LMArena visionLMArena, Oct 19, 2026 | #10 | On LMArena |
| LMArena documentsLMArena, Sep 13, 2026 | Not in the top 20 |
| Test | Rank | Score |
|---|---|---|
| GPQA DiamondVals AI, Sep 1, 2026 | Not in the top 20 | |
| MMMU ProVals AI, Sep 1, 2026 | Not in the top 20 |
| Test | Rank | Score |
|---|---|---|
| Vectara hallucination testVectara, Oct 16, 2026 | Not in our copy of the list |
“Not in the top” means it isn't among the models in our copy of that list, which runs to the position shown; it may not have been tested. Vectara's test ranks by how rarely a model adds facts, so lower is better. Positions can be shared when scores tie. Epoch's range is its margin of uncertainty. Epoch AI and Vectara data: CC BY 4.0 and Apache-2.0.
What Claude costs.
Anthropic's chat app, priced by the month in US dollars on its own pages. Which plans include Claude Opus 5.5 is on Anthropic's pages.
Every chat app's plans| Plan | A month |
|---|---|
| Free | Free |
| Pro | $20 |
| Max | from $100 |
| Team (Standard seat) | $25 a seat |
| Team (Premium seat) | $125 a seat |
| Enterprise | $20 a seat + usage |
Anthropic pricing page, Oct 20, 2026 · company-reported
Our note: Claude docs recommend starting with Opus 5.5 'for most workloads'. Context 1M tokens, max output 128K tokens. Older Opus 5 ($5/$25) and Opus 4.8 ($5/$25) are still listed under legacy models on the pricing page.