GPT-OSS 20B vs Claude 4.5 Haiku
Compare pricing, context windows, and strengths for GPT-OSS 20B by OpenAI and Claude 4.5 Haiku by Anthropic - and see how to put either to work in Appaca.
GPT-OSS 20B
A 21-billion-parameter open-weight model from OpenAI, designed for efficient reasoning and long-context usage (≈ 128K tokens).
View GPT-OSS 20BClaude 4.5 Haiku
A fast, small model delivering near-frontier coding and computer-use performance at ultra-low cost with exceptional speed and strong safety.
View Claude 4.5 HaikuGPT-OSS 20B vs Claude 4.5 Haiku at a glance
Specs and pricing side by side, from the Appaca AI models directory.
| Spec | GPT-OSS 20B | Claude 4.5 Haiku |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Model type | Text | Text |
| Context window | 128K tokens | 200K tokens |
| Input price | Free (open weight) | $1 / 1M tokens |
| Output price | Free (open weight) | $5 / 1M tokens |
| Status | Current | Current |
How GPT-OSS 20B and Claude 4.5 Haiku differ
What the numbers mean in practice when choosing between GPT-OSS 20B and Claude 4.5 Haiku.
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GPT-OSS 20B is an open-weight model with no per-token licensing fees, while Claude 4.5 Haiku charges $1 per million input tokens.
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Claude 4.5 Haiku's 200K tokens context window is roughly 1.6x larger than GPT-OSS 20B's 128K tokens, so it can work across bigger codebases, contracts, or archives in one pass.
Strengths side by side
Where each model shines, according to benchmarks and provider positioning.
GPT-OSS 20B
- Open-weight / Apache 2.0 licensed: you can use, modify, and deploy freely (commercially & academically) under permissive terms.
- Large model size (≈ 21B parameters) with Mixture-of-Experts (MoE) architecture: only ~3.6B parameters active per token, yielding efficient inference.
- Very long context window support: up to ~128 K tokens (or ~131 K tokens per some sources) enabling in-depth reasoning, long documents, or multi-turn context.
- Adjustable reasoning effort: you can trade latency vs quality by tuning “reasoning effort” levels.
- Efficient hardware requirements (for its class): designed to run on a single 16 GB-class GPU or optimized local deployments for lower latency applications.
- Strong for tasks such as reasoning, tool-use, structured output, chain-of-thought debugging: because the model is open and you can inspect its chain of thought.
- Flexibility: since weights are available, you can self-host, fine-tune, or deploy offline, giving more control than closed API models.
Claude 4.5 Haiku
1. Frontier-level coding at small-model speed
- Similar coding performance to Claude Sonnet 4 at one-third the cost.
- Runs 4-5x faster than Sonnet 4.5 for many tasks.
- Ideal for real-time pair programming, prototyping, and rapid iteration.
2. Excellent computer-use abilities
- Surpasses Claude Sonnet 4 in certain computer-control tasks.
- Great for agents requiring low-latency tool use (Chrome automation, coding agents, etc.).
3. Perfect for real-time, low-latency applications
- Chat assistants
- Customer support agents
- Interactive development loops
- Multi-agent orchestration
4. Works seamlessly with Sonnet 4.5 in hybrid agent setups
- Sonnet 4.5 plans complex workflows.
- Haiku 4.5 executes subtasks in parallel for speed and cost-efficiency.
5. High alignment & safest Claude model by metric
- Lower misaligned behavior rates than Haiku 3.5, Sonnet 4.5, and Opus 4.1.
- Limited CBRN risk → released under AI Safety Level 2 (ASL-2).
Use GPT-OSS 20B or Claude 4.5 Haiku - or both
Appaca is the AI workspace for operators. Build internal tools and AI co-workers powered by GPT-OSS 20B or Claude 4.5 Haiku - connected to your real data and ready for your whole team. No code, no deployment.
Describe it, and it's built
Tell the Appaca agent the internal tool you need and it builds a working app powered by GPT-OSS 20B or Claude 4.5 Haiku. No code, no API keys, no deployment.
Switch models without rebuilding
Start on GPT-OSS 20B, test the same tool on Claude 4.5 Haiku, and keep whichever performs better - the rest of your app stays exactly as it is.
Automated for the whole team
Schedule tools to run on autopilot - daily digests, weekly reports, real-time triggers - and share them with your whole team from one workspace.
Describe it, and it's built
Tell the Appaca agent what your team needs and it builds a working app powered by GPT-OSS 20B or Claude 4.5 Haiku - connected to the tools you already use.
Related comparisons
See how GPT-OSS 20B and Claude 4.5 Haiku stack up against other models in the directory.
FAQs
GPT-OSS 20B is open weight and free of per-token licensing fees, while Claude 4.5 Haiku costs $1 per million input tokens and $5 per million output tokens.
Claude 4.5 Haiku has the larger context window at 200K tokens, compared to 128K tokens for GPT-OSS 20B. A larger window means the model can consider more text at once - useful for long contracts, codebases, or months of records.
It depends on the job. Compare the pricing, context window, and strengths above against your workload - and remember the choice isn't permanent. In Appaca you can build a tool on GPT-OSS 20B, test the same tool on Claude 4.5 Haiku, and switch at any time without rebuilding anything.
Yes. Appaca is a no-code AI workspace: describe the internal tool your team needs and the Appaca agent builds it as a working app powered by GPT-OSS 20B, Claude 4.5 Haiku, or any other model in the directory - with a built-in database, team access, and integrations. No API keys to wire up and nothing to deploy.
Build AI tools with GPT-OSS 20B or Claude 4.5 Haiku
Describe the tool your team needs and get a working app powered by the model you choose - with a built-in database, team access, and integrations. No code, no deployment.