Model Tracker
Claude Opus 4.1
Claude Opus 4.1 is an AI model made by Anthropic. Anthropic released it on 5 August 2025. Anthropic retired it on 5 August 2026. Through the API it costs $15.
Claude Opus 4.1 is an AI model made by Anthropic. Anthropic released it on 5 August 2025. Anthropic retired it on 5 August 2026. Through the API it costs $15.00 per 1M tokens for input and $75.00 per 1M tokens for output.
- Released
- 5 August 2025 — www.anthropic.com, read 16 October 2026
- Status
- Not confirmed: two readings disagree: retired and ga
- Takes
- Not confirmed: The official pages reviewed do not explicitly state Claude Opus 4.1's input modalities.
- Returns
- Not confirmed: The official pages reviewed do not explicitly state Claude Opus 4.1's output modalities.
- Open weights
- Not confirmed: The maker's pages reviewed do not state whether Claude Opus 4.1's weights are open.
- Licence
- Not confirmed: The maker's pages reviewed do not name a licence for Claude Opus 4.1.
- Context window
- Not confirmed: The model card and API documentation reviewed do not print a standard context-window figure specifically for Claude Opus 4.1.
- Longest answer
- Not confirmed: The model card and API documentation reviewed do not print a standard maximum-output-token limit specifically for Claude Opus 4.1.
- Knowledge cutoff
- Not confirmed: The currently accessible official help page no longer lists a cutoff for Claude Opus 4.1, and the reviewed model card and API documentation do not print one.
- API price, input
- $15.00 per 1M tokens — platform.claude.com, read 16 October 2026
- API price, output
- $75.00 per 1M tokens — platform.claude.com, read 16 October 2026
- Where
- Not confirmed: two readings disagree: cloud and api, app, cloud
- Parameters
- Not confirmed: The maker's pages reviewed do not publish a parameter count for Claude Opus 4.1.
- Model card
- Not confirmed: two readings disagree: https://www.anthropic.com/claude-opus-4-1-system-card and https://www.anthropic.com/document/claude-opus-4-1-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-4-1-20250805-thinking-16k: 1,450 (1,446–1,453, 49,542 votes), published 15 October 2026
- Text Arena, claude-opus-4-1-20250805: 1,448 (1,445–1,451, 77,238 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 4.1: 144.1 (142.0–146.1), as of 19 October 2026
- GPQA Diamond, claude-opus-4-1-20250805_16K: 77.3% (± 3.0), run 5 August 2025
- GPQA Diamond, claude-opus-4-1-20250805_27K: 76.8% (± 3.0), run 5 August 2025
- GPQA Diamond, claude-opus-4-1-20250805: 73.2% (± 3.2), run 5 August 2025
- FrontierMath, tiers 1–3, claude-opus-4-1-20250805_32K: 12.6% (± 2.0), run 11 June 2026
- FrontierMath, tier 4, claude-opus-4-1-20250805_32K: 2.4% (± 2.4), run 11 June 2026
- SWE-bench Verified, claude-opus-4-1-20250805: 73.3% (± 2.0), run 11 February 2026
- OTIS Mock AIME 2024–2025, claude-opus-4-1-20250805_27K: 68.9% (± 7.0), run 5 August 2025
- OTIS Mock AIME 2024–2025, claude-opus-4-1-20250805_16K: 64.4% (± 7.2), run 5 August 2025
- OTIS Mock AIME 2024–2025, claude-opus-4-1-20250805: 40.0% (± 7.4), run 5 August 2025
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 4.1 released?
Anthropic released Claude Opus 4.1 on 5 August 2025.
How much does the Claude Opus 4.1 API cost?
On the standard tier, Claude Opus 4.1 costs $15.00 per 1M tokens for input and $75.00 per 1M tokens for output, as Anthropic lists it.
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 4.5
- Claude Opus 4.6
- Claude Opus 4.7
- Claude Opus 4.8
- Claude Opus 5
- Claude Opus 5.5
Sources
- Claude Opus 4.1 (read 16 October 2026)
- Model deprecations (read 16 October 2026)
- Pricing (read 16 October 2026)
- Claude on Amazon Bedrock (Opus 4.6 and earlier) (read 16 October 2026)
- Claude 4.1 System Card (read 16 October 2026)
- How up-to-date is Claude's training data? (read 16 October 2026)