Intelligence index
Outperforms 84% of compared models
Claude Sonnet 5
Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work. It supports adaptive thinking with selectable reasoning effort levels (low, medium, high, max, and x-high), a 1M-token context window, and text, image, and file inputs. Sonnet 5 uses an updated tokenizer and includes real-time cyber safeguards that block certain high-risk dual-use activities.
- Input / output price
- $2/$10per 1M tokens
- Context
- 1.0M
- Released
- 2026-06-30
Pricing
Artificial Analysis
Explore rankingsCoding index
Outperforms 85% of compared models
Agentic index
Outperforms 85% of compared models
Design Arena
Elo scores and win rates across design and agent tasks.
Category performance
1,000-1,500 EloModel Arena
Asciiart
1205Elo
Win rate 51%
Game Development
1274Elo
Win rate 51.1%
Code Categories
1274Elo
Win rate 52.5%
Website
1273Elo
Win rate 52.2%
3D
1258Elo
Win rate 53.9%
UI Component
1273Elo
Win rate 53.6%
SVG
1190Elo
Win rate 49.1%
Data Visualization
1251Elo
Win rate 52.8%
Agent Arena
1200Elo
Win rate 60%
Agenticgamedev
1188Elo
Win rate 51.8%
Androidnative
1223Elo
Win rate 54.2%
Fullstack
1249Elo
Win rate 53.7%
Htmlslides
1114Elo
Win rate 53.7%
Godotgamedev
1225Elo
Win rate 54.4%
Webapps
1244Elo
Win rate 53%
Python-pptxslides
1171Elo
Win rate 50.1%
Spreadsheet
1108Elo
Win rate 48.6%
Mobile Apps
1210Elo
Win rate 50.6%
Blender3d
1090Elo
Win rate 40.5%
Related Models
Claude Opus 5.5
anthropicClaude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code review and bug finding, financial and scientific analysis, and reading dense charts, diagrams, and screenshots, and it is more careful than its predecessor about only stating figures and citing sources it can back up. The model completes comparable tasks in fewer steps and with fewer tokens than Opus 5, and reports on its work in plainer language, with clear updates on what it did, what it found, and what it needs from the user. Thinking is always adaptive, so effort is the main lever for trading off depth, latency, and cost, and lower effort settings remain effective for latency-sensitive workloads.
- Context
- 1.0M
- Max output
- 128K
- Released
- 2026-09-22
- Input
- $4/M
- Output
- $20/M
- Cache read
- $0.2/M
Claude Sonnet 5.5
anthropicClaude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing polished documents, slides, and spreadsheets, and it writes and communicates more clearly than its predecessor. Thinking is always on, so effort is the main lever for trading off depth, latency, and cost, and lower effort settings keep it responsive for everyday agentic loops.
- Context
- 1.0M
- Max output
- 128K
- Released
- 2026-09-28
- Input
- $2/M
- Output
- $10/M
- Cache read
- $0.1/M
Claude Fable 5.1
anthropicClaude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual code generation, and finance and analysis tasks in particular. It also tends to be more concise than Fable 5 in its plans and summaries. We recommend testing it as a direct upgrade wherever you use Fable 5 today, and alongside Opus 5 on reasoning-heavy tasks.
- Context
- 1.0M
- Max output
- 128K
- Released
- 2026-09-01
- Input
- $10/M
- Output
- $50/M
- Cache read
- $0.25/M