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Claude Sonnet 4.5 vs GPT-4o
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 32.2% higher average benchmark score. Claude Sonnet 4.5 offers 119.6K more tokens in context window than GPT-4o. GPT-4o is $5.50 cheaper per million tokens. Claude Sonnet 4.5 is available on 3 providers. Overall, Claude Sonnet 4.5 is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4.5, released by Anthropic in September 2025, is a large language model from the Claude 4.5 family that balances response quality and efficiency for coding, agentic tasks, and analytical work. It features a 200K token context window (extendable to 1M tokens in beta), 64K maximum output tokens, native image understanding, and extended thinking support. Sonnet 4.5 targets use cases that require a balance of throughput and reasoning depth, including code generation, data analysis, and multi-step agentic pipelines.
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OpenAI
GPT-4o, released by OpenAI in May 2024, is a multimodal large language model from the GPT-4 family that natively processes text, image, and audio inputs in a single end-to-end model. It features a 128K token context window and demonstrated competitive performance across coding, reasoning, and vision benchmarks at its release. GPT-4o targets general-purpose assistant applications, vision-enabled workflows, and use cases requiring low-latency multimodal understanding.
1 year newer
GPT-4o
OpenAI
2024-05-13
Claude Sonnet 4.5
Anthropic
2025-09-29
Pricing Comparison
Cost per million tokens (USD)
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Claude Sonnet 4.5
Input:$3.00
Output:$15.00
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GPT-4o
Input:$2.50
Output:$10.00($5.50 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 3 common benchmarks
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Claude Sonnet 4.5
Average Score:56.6%(+32.2%)
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GPT-4o
Average Score:24.4%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Science83.4%(+27.3%)
Tool Use43.8%(+36.6%)
Agents42.5%(+32.6%)
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Knowledge Cutoff
Training data recency comparison
GPT-4o
2024-04
Claude Sonnet 4.5
2025-01
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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Claude Sonnet 4.5
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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GPT-4o
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Claude Sonnet 4.5
Avg Score:56.6%(+32.2%)
Providers:3
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GPT-4o
Avg Score:24.4%
Providers:1