Claude Haiku 4.5 vs GPT-OSS 20B
Fast, cheap, surprisingly smart. Meanwhile, gpt-oss 20b: openai's open-weights return.
Side-by-side
Specs
| Dimension | Claude Haiku 4.5 | GPT-OSS 20B |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Released | 2025-10 | 2025-09 |
| Context window | ✓200K | 128K |
| Output max | 8K | 8K |
| Input /M | $1.00 | ✓$0.15 |
| Output /M | $5.00 | ✓$0.60 |
| Modalities | ✓text, image | text |
| Open weights | no | ✓yes |
Scorecard
Dimension-by-dimension
Claude Haiku 4.5
GPT-OSS 20B
reasoning
7.0
7.0
coding
7.0
7.0
writing
8.0
7.0
speed
10.0
9.0
value
10.0
10.0
Verdict
Which wins, by use case
| Use case | Winner | Why |
|---|---|---|
| coding | Claude Haiku 4.5 | a coin flip on our weighted coding score |
| writing | Claude Haiku 4.5 | a coin flip on our weighted writing score |
| chat | Claude Haiku 4.5 | a clear edge on our weighted chat score |
| agents | Claude Haiku 4.5 | a coin flip on our weighted agents score |
| summarization | Claude Haiku 4.5 | a coin flip on our weighted summarization score |
| translation | Claude Haiku 4.5 | a coin flip on our weighted translation score |
| reasoning | Claude Haiku 4.5 | a coin flip on our weighted reasoning score |
| research | Claude Haiku 4.5 | a coin flip on our weighted research score |
| vision and multimodal | Claude Haiku 4.5 | a coin flip on our weighted vision score |
| Cheapest AI models for bulk workloads | Claude Haiku 4.5 | a coin flip on our weighted cheap-bulk score |
Bottom line
Our take
Pick Claude Haiku 4.5 if you need: very fast, great cost profile.
Pick GPT-OSS 20B if you need: single-gpu inference, open weights.
At a 500M-input / 150M-output monthly volume, Claude Haiku 4.5 costs roughly $1250 vs GPT-OSS 20B at $165. Use our calculator to plug in your own numbers.
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