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Claude Haiku 4.5 vs GPT-OSS-20B
Comprehensive side-by-side LLM comparison
GPT-OSS-20B leads with 7.1% higher average benchmark score. Claude Haiku 4.5 offers 131.9K more tokens in context window than GPT-OSS-20B. Claude Haiku 4.5 is $Infinity cheaper per million tokens. Claude Haiku 4.5 supports multimodal inputs. Claude Haiku 4.5 is available on 3 providers. Overall, GPT-OSS-20B is the stronger choice for coding tasks.
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Anthropic
Claude Haiku 4.5, released by Anthropic in October 2025, is a fast, efficient large language model from the Claude 4.5 family optimized for high-throughput, low-latency workloads. It features a 200K token context window, 64K maximum output tokens, native image understanding, and extended thinking capabilities. Haiku 4.5 targets latency-sensitive applications such as real-time assistants, document classification, and lightweight agentic tasks where rapid response times are a primary requirement.
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OpenAI
GPT-OSS-20B is an open-weight large language model with 20 billion parameters from OpenAI's open-source model initiative. It targets deployments requiring a smaller, efficient model that can run on consumer or mid-tier hardware while maintaining strong reasoning and coding capabilities relative to its size.
1 month newer
GPT-OSS-20B
OpenAI
2025-08-05
Claude Haiku 4.5
Anthropic
2025-10-01
Pricing Comparison
Cost per million tokens (USD)
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Claude Haiku 4.5
Input:$1.00
Output:$5.00($Infinity cheaper)
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GPT-OSS-20B
Input:$Infinity
Output:$Infinity
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Haiku 4.5
Average Score:73.0%
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GPT-OSS-20B
Average Score:80.1%(+7.1%)
Performance comparison across key benchmark categories
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Claude Haiku 4.5
Science73.0%
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GPT-OSS-20B
Science80.1%(+7.1%)
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Knowledge Cutoff
Training data recency comparison
Claude Haiku 4.5
2025-02
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 Haiku 4.5
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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GPT-OSS-20B
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Claude Haiku 4.5
Avg Score:73.0%
Providers:3
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GPT-OSS-20B
Avg Score:80.1%(+7.1%)
Providers:1