GLM-5 9B vs gpt-oss-120b
GLM-5 9B (2026) and gpt-oss-120b (2025) are frontier reasoning models from Zhipu AI and OpenAI. GLM-5 9B ships a 262k-token context window, while gpt-oss-120b ships a 131k-token context window. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads. It focuses on practical selection signals rather than broad model-family marketing.
GLM-5 9B is safer overall; choose gpt-oss-120b when provider fit matters.
Decision scorecard
Local evidence first| Signal | GLM-5 9B | gpt-oss-120b |
|---|---|---|
| Best for | reasoning-heavy apps and tool-calling agents | tool-calling agents and provider-routed production |
| Decision fit | RAG, Agents, and Long context | RAG, Agents, and Long context |
| Context window | 262k | 131k |
| Cheapest output | - | $0.18/1M tokens |
| Provider routes | 0 tracked | 10 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- GLM-5 9B has the larger context window for long prompts, retrieval packs, or transcript analysis.
- GLM-5 9B uniquely exposes Reasoning in local model data.
- Local decision data tags GLM-5 9B for RAG, Agents, and Long context.
- gpt-oss-120b has broader tracked provider coverage for fallback and procurement flexibility.
- gpt-oss-120b uniquely exposes Structured outputs in local model data.
- Local decision data tags gpt-oss-120b for RAG, Agents, and Long context.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
GLM-5 9B
Unavailable
No complete token price in local provider data
gpt-oss-120b
$76.20
Cheapest tracked route/tier: OpenRouter
Cost delta unavailable until both models have sourced input and output token prices.
Switch friction
- No overlapping tracked provider route is sourced for GLM-5 9B and gpt-oss-120b; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Reasoning before moving production traffic.
- gpt-oss-120b adds Structured outputs in local capability data.
- No overlapping tracked provider route is sourced for gpt-oss-120b and GLM-5 9B; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Structured outputs before moving production traffic.
- GLM-5 9B adds Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-02-15 | 2025-08-05 |
| Context window | 262k | 131k |
| Parameters | 9 | 120B |
| Architecture | decoder only | decoder only |
| License | Open Weights | Open Weights |
| Knowledge cutoff | 2025-11 | 2025-08 |
Pricing and availability
| Pricing attribute | GLM-5 9B | gpt-oss-120b |
|---|---|---|
| Input price | - | $0.04/1M tokens |
| Output price | - | $0.18/1M tokens |
| Providers | - |
Capabilities
| Capability | GLM-5 9B | gpt-oss-120b |
|---|---|---|
| Vision | No | No |
| Multimodal | No | No |
| Reasoning | Yes | No |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | No | Yes |
| Code execution | No | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on reasoning mode: GLM-5 9B and structured outputs: gpt-oss-120b. Both models share function calling and tool use, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
Pricing coverage is uneven: GLM-5 9B has no token price sourced yet and gpt-oss-120b has $0.04/1M input tokens. Provider availability is 0 tracked routes versus 10. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose GLM-5 9B when reasoning depth and larger context windows are central to the workload. Choose gpt-oss-120b when provider fit and broader provider choice are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions. It also helps separate model capability from provider packaging, which can change cost and latency. For teams standardizing a stack, that distinction is often the difference between a benchmark win and a reliable deployment.
FAQ
Which has a larger context window, GLM-5 9B or gpt-oss-120b?
GLM-5 9B supports 262k tokens, while gpt-oss-120b supports 131k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Is GLM-5 9B or gpt-oss-120b open source?
GLM-5 9B is listed under Open Weights. gpt-oss-120b is listed under Open Weights. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for reasoning mode, GLM-5 9B or gpt-oss-120b?
GLM-5 9B has the clearer documented reasoning mode signal in this comparison. If reasoning mode is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for function calling, GLM-5 9B or gpt-oss-120b?
Both GLM-5 9B and gpt-oss-120b expose function calling. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is better for tool use, GLM-5 9B or gpt-oss-120b?
Both GLM-5 9B and gpt-oss-120b expose tool use. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Where can I run GLM-5 9B and gpt-oss-120b?
GLM-5 9B is available on the tracked providers still being sourced. gpt-oss-120b is available on Cloudflare Workers AI, OpenRouter, Together AI, Fireworks AI, and GCP Vertex AI. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-05-22. Data sourced from public model cards and provider documentation.