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Claude Haiku 4.5 vs GPT-OSS-120B
Comprehensive side-by-side LLM comparison
GPT-OSS-120B leads with 5.3% higher average benchmark score. Claude Haiku 4.5 offers 131.9K more tokens in context window than GPT-OSS-120B. 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-120B 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-120B, released by OpenAI in August 2025, is an open-weight large language model with 120 billion parameters distributed under the Apache 2.0 license. It represents OpenAI's entry into the open-source model space, enabling developers to self-host and fine-tune a GPT-5-generation-class model. GPT-OSS-120B targets research applications, on-premises deployments, and custom fine-tuning workflows requiring a large open-weight base model.
2 months newer
GPT-OSS-120B
OpenAI
2025-08
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-120B
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-120B
Average Score:78.3%(+5.3%)
Performance comparison across key benchmark categories
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Claude Haiku 4.5
Science73.0%
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GPT-OSS-120B
Science78.3%(+5.3%)
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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-120B
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Claude Haiku 4.5
Avg Score:73.0%
Providers:3
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GPT-OSS-120B
Avg Score:78.3%(+5.3%)
Providers:1