Model Tracker
Claude Opus 4.5
Claude Opus 4.5 is an AI model made by Anthropic. Anthropic released it on 24 November 2025. It takes text, image and returns text.
Claude Opus 4.5 is an AI model made by Anthropic. Anthropic released it on 24 November 2025. It takes text, image and returns text. Its context window is 200,000 tokens. Its longest answer is 64,000 tokens. Through the API it costs $5.00 per 1M tokens for input and $25.00 per 1M tokens for output. Its knowledge cutoff is May 2025.
- Released
- 24 November 2025 — platform.claude.com, read 16 October 2026
- Status
- Not confirmed: two readings disagree: ga and deprecated
- Takes
- Text, Image — platform.claude.com, read 16 October 2026
- Returns
- Text — platform.claude.com, read 16 October 2026
- Open weights
- Not confirmed: The reviewed maker pages do not state whether downloadable weights are available; no value is inferred.
- Licence
- Not confirmed: The reviewed maker pages do not name a weights licence; no licence is inferred.
- Context window
- 200,000 tokens — platform.claude.com, read 16 October 2026
- Longest answer
- 64,000 tokens — platform.claude.com, read 16 October 2026
- Knowledge cutoff
- May 2025 — platform.claude.com, read 16 October 2026
- API price, input
- $5.00 per 1M tokens — platform.claude.com, read 16 October 2026
- API price, output
- $25.00 per 1M tokens — platform.claude.com, read 16 October 2026
- Where
- API, Consumer app, Cloud marketplaces — www.anthropic.com, read 16 October 2026
- Parameters
- Not confirmed: The reviewed maker pages do not publish a parameter count.
- Model card
- Not confirmed: two readings disagree: https://assets.anthropic.com/m/64823ba7485345a7/Claude-Opus-4-5-System-Card.pdf and https://www.anthropic.com/claude-opus-4-5-system-card
Benchmarks
Measured by others, not by the maker: each score with the name the measurer gives the model and the setting it ran, its day and its licence.
Arena
- Text Arena, claude-opus-4-5-20251101-high-32k: 1,474 (1,470–1,477, 37,509 votes), published 15 October 2026
- Text Arena, claude-opus-4-5-20251101: 1,470 (1,466–1,473, 72,899 votes), published 15 October 2026
Arena’s leaderboard dataset (lmarena-ai/leaderboard-dataset on Hugging Face), CC BY 4.0: ratings from people’s votes between two anonymous models, as Arena publishes them. Data · CC BY 4.0
Epoch AI
- Epoch Capabilities Index, Claude Opus 4.5: 150.2 (148.0–152.8), as of 19 October 2026
- GPQA Diamond, claude-opus-4-5-20251101_32K: 86.0% (± 2.1), run 24 November 2025
- GPQA Diamond, claude-opus-4-5-20251101_16K: 85.5% (± 2.2), run 25 November 2025
- GPQA Diamond, claude-opus-4-5-20251101: 80.7% (± 2.4), run 24 November 2025
- FrontierMath, tiers 1–3, claude-opus-4-5-20251101_32K: 34.4% (± 2.8), run 11 June 2026
- FrontierMath, tier 4, claude-opus-4-5-20251101_32K: 4.9% (± 3.4), run 11 June 2026
- SWE-bench Verified, claude-opus-4-5-20251101: 76.7% (± 1.9), run 5 February 2026
- OTIS Mock AIME 2024–2025, claude-opus-4-5-20251101_32K: 86.1% (± 4.3), run 24 November 2025
- OTIS Mock AIME 2024–2025, claude-opus-4-5-20251101_16K: 81.7% (± 5.0), run 24 November 2025
- OTIS Mock AIME 2024–2025, claude-opus-4-5-20251101: 48.1% (± 6.4), run 24 November 2025
- SimpleQA Verified, claude-opus-4-5-20251101_32K: 45.7% (± 1.6), run 27 August 2026
Epoch AI, ‘Capabilities & benchmarking’, epoch.ai/benchmarks, CC BY 4.0: Epoch AI’s own runs and its Capabilities Index. Data · CC BY 4.0
Questions
When was Claude Opus 4.5 released?
Anthropic released Claude Opus 4.5 on 24 November 2025.
What is the context window of Claude Opus 4.5?
The context window of Claude Opus 4.5 is 200,000 tokens, as Anthropic prints it.
How much does the Claude Opus 4.5 API cost?
On the standard tier, Claude Opus 4.5 costs $5.00 per 1M tokens for input and $25.00 per 1M tokens for output, as Anthropic lists it.
What does Claude Opus 4.5 take and return?
Claude Opus 4.5 takes text, image and returns text.
What is the knowledge cutoff of Claude Opus 4.5?
The knowledge cutoff of Claude Opus 4.5 is May 2025.
More from Anthropic
- Claude 1.0
- Claude 1.1
- Claude 1.2
- Claude 1.3
- Claude 2
- Claude 2.1
- Claude 3 Haiku
- Claude 3 Opus
- Claude 3 Sonnet
- Claude 3.5 Haiku
- Claude Fable 5
- Claude Fable 5.1
- Claude Haiku 4.5
- Claude Haiku 5.5
- Claude Instant 1.0
- Claude Instant 1.1
- Claude Instant 1.2
- Claude Mythos Preview
- Claude Opus 4.1
- Claude Opus 4.6
- Claude Opus 4.7
- Claude Opus 4.8
- Claude Opus 5
- Claude Opus 5.5
Sources
- Claude Opus 4.5 - Claude Platform Docs (read 16 October 2026)
- Model deprecations - Claude Platform Docs (read 16 October 2026)
- Anthropic’s Transparency Hub (read 16 October 2026)
- Pricing - Claude Platform Docs (read 16 October 2026)
- Claude Opus 4.5 System Card (read 16 October 2026)