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Claude Sonnet 4.5 vs GPT-4.1
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 35.2% higher average benchmark score. GPT-4.1 offers 768.8K more tokens in context window than Claude Sonnet 4.5. GPT-4.1 is $8.00 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-4.1, released by OpenAI in April 2025, is a large language model from the GPT-4 family optimized for coding, precise instruction following, and long-context tasks. It features a 1M token context window and native image understanding, with improved performance on tool-calling and web development benchmarks compared to GPT-4o. GPT-4.1 targets software development workflows, long-document analysis, and applications requiring accurate, instruction-adherent outputs.
5 months newer
GPT-4.1
OpenAI
2025-04-14
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-4.1
Input:$2.00
Output:$8.00($8.00 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 3 common benchmarks
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Claude Sonnet 4.5
Average Score:70.7%(+35.2%)
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GPT-4.1
Average Score:35.5%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Science83.4%(+35.3%)
Agents64.3%(+35.1%)
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GPT-4.1
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Knowledge Cutoff
Training data recency comparison
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-4.1
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Claude Sonnet 4.5
Avg Score:70.7%(+35.2%)
Providers:3
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GPT-4.1
Avg Score:35.5%
Providers:1