Claude Sonnet 4.5
Anthropic's balanced Sonnet 4.5 for production coding and agent workflows.
Pricing
Specifications
Benchmark Scores
Strengths
- Coding excellence
- Speed/quality balance
- Strong agents
Weaknesses
- Below Opus on hardest analysis
Historical Intelligence
Pricing, context, and benchmark trends over time
Pricing History
Input and output price per million tokens over time
Context Window Growth
Context window tokens over time
Coding Score Progress
Benchmark score over time (0–100)
Reasoning Score Progress
Benchmark score over time (0–100)
Claude Sonnet 4.5 Evolution
Combined pricing trend and benchmark performance
Claude Sonnet 4.5 vs related models
Capability radar vs semantically related catalog models
Intelligence Graph
Provider hub →Provider Overview
Anthropic develops the Claude family of AI models focused on safety, reliability, and enterprise-grade performance. Claude excels at coding, analysis, and long-form writing.
9 models tracked · Documentation
Related Models
Computed from benchmark, pricing, and capability similarity
Claude 4 Sonnet
Latest Sonnet with improved reasoning and tool use.
Why: same provider (Anthropic), similar coding performance
Confidence95%Claude 3.7 Sonnet
Sonnet with extended thinking for harder problems.
Why: same provider (Anthropic), similar coding performance
Confidence95%Grok 4
xAI Grok 4 with real-time retrieval emphasis and strong general capability.
Why: similar coding performance, similar reasoning scores
Confidence92%Claude 3.5 Sonnet
Balanced Claude model excelling at coding and analysis.
Why: same provider (Anthropic), similar coding performance
Confidence91%Claude 4 Haiku
Next-gen Haiku with Claude 4 intelligence at low cost.
Why: same provider (Anthropic), both vision-capable
Confidence91%Kimi K3
Moonshot flagship open-frontier model with ~2.8T parameters, native vision, and a 1M-token context window.
Why: similar coding performance, similar reasoning scores
Confidence90%
Recommended Comparisons
Side-by-side analysis with semantically similar models
Claude Sonnet 4.5 vs Claude 4 Sonnet
Side-by-side pricing, benchmarks, and capabilities
Why: same provider (Anthropic), similar coding performance
Confidence95%Claude Sonnet 4.5 vs Claude 3.7 Sonnet
Side-by-side pricing, benchmarks, and capabilities
Why: same provider (Anthropic), similar coding performance
Confidence95%Claude Sonnet 4.5 vs Grok 4
Side-by-side pricing, benchmarks, and capabilities
Why: similar coding performance, similar reasoning scores
Confidence92%Claude Sonnet 4.5 vs Claude 3.5 Sonnet
Side-by-side pricing, benchmarks, and capabilities
Why: same provider (Anthropic), similar coding performance
Confidence91%Claude Sonnet 4.5 vs Claude 4 Haiku
Side-by-side pricing, benchmarks, and capabilities
Why: same provider (Anthropic), both vision-capable
Confidence91%Claude Sonnet 4.5 vs Kimi K3
Side-by-side pricing, benchmarks, and capabilities
Why: similar coding performance, similar reasoning scores
Confidence90%
Best Alternatives
Higher-scoring models with similar capability profiles
Claude 4 Opus
Anthropic flagship for the most demanding tasks.
Why: +4 overall benchmark score, same provider (Anthropic), similar coding performance
Confidence80%GPT-5
OpenAI flagship GPT-5 generation for general and agentic workloads.
Why: +3 overall benchmark score, similar coding performance, similar reasoning scores
Confidence84%Claude Opus 4.1
Anthropic's latest Opus-class model for deep reasoning, coding, and long-form analysis.
Why: +3 overall benchmark score, same provider (Anthropic), similar coding performance
Confidence82%Claude 4 Sonnet
Latest Sonnet with improved reasoning and tool use.
Why: +2 overall benchmark score, same provider (Anthropic), similar coding performance
Confidence95%
Cheaper Alternatives
Lower-cost models with comparable attributes
Claude 4 Haiku
Next-gen Haiku with Claude 4 intelligence at low cost.
Why: Saves $13.20/M combined tokens vs Claude Sonnet 4.5
Confidence91%GPT-5 Mini
Cost-efficient GPT-5 family model for high-volume production.
Why: Saves $16.00/M combined tokens vs Claude Sonnet 4.5
Confidence89%Claude 3.5 Haiku
Fast and affordable Claude for high-throughput workloads.
Why: Saves $13.20/M combined tokens vs Claude Sonnet 4.5
Confidence88%Gemini 3.6 Flash
Google's speed-optimized Gemini 3.6 Flash with frontier-level intelligence at lower cost than prior Flash tiers.
Why: Saves $9.00/M combined tokens vs Claude Sonnet 4.5
Confidence84%
Related Calculators
AI Cost Calculator
Estimate daily, monthly, and yearly API costs with provider and model selection.
Why: Estimate costs for Claude Sonnet 4.5
Inference Latency Estimator
Project response times based on output tokens and throughput.
Why: fast latency tier estimation
Token Counter
Convert between words and estimated token counts.
Why: Token estimation for prompt workloads
Context Window Utilization
Calculate how much of a model's context window you're consuming.
Why: 200K context window analysis
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Timeline Highlights
Claude Sonnet 4.5 — Model Release
Why: Direct model timeline event
Claude Sonnet 4.5 — API Release
Why: Direct model timeline event
Claude Sonnet 4.5 — Pricing Update
Why: Direct model timeline event
Claude Sonnet 4.5 — Vision Support
Why: Direct model timeline event
Claude Sonnet 4.5 — Function Calling
Why: Direct model timeline event
Latest Releases
Recent launches from related providers