Gemma 3 12B Instruct vs GLM-5.1
Gemma 3 12B Instruct (2025) and GLM-5.1 (2026) are frontier reasoning models from Google DeepMind and Zhipu AI. Gemma 3 12B Instruct ships a 128k-token context window, while GLM-5.1 ships a 200k-token context window. On pricing, Gemma 3 12B Instruct costs $0.20/1M input tokens versus $0.98/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Gemma 3 12B Instruct is ~390% cheaper at $0.20/1M; pay for GLM-5.1 only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Gemma 3 12B Instruct | GLM-5.1 |
|---|---|---|
| Best for | general production evaluation | reasoning-heavy apps, tool-calling agents, and provider-routed production |
| Decision fit | Long context | Coding, RAG, and Agents |
| Context window | 128k | 200k |
| Cheapest output | $0.20/1M tokens | $3.08/1M tokens |
| Provider routes | 1 tracked | 5 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Gemma 3 12B Instruct has the lower cheapest tracked output price at $0.20/1M tokens.
- Local decision data tags Gemma 3 12B Instruct for Long context.
- GLM-5.1 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- GLM-5.1 has broader tracked provider coverage for fallback and procurement flexibility.
- GLM-5.1 uniquely exposes Reasoning, Function calling, and Tool use in local model data.
- Local decision data tags GLM-5.1 for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Gemma 3 12B Instruct
$210
Cheapest tracked route/tier: Fireworks AI
GLM-5.1
$1,554
Cheapest tracked route/tier: Z.ai
Estimated monthly gap: $1,344. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on Fireworks AI; start route-level A/B tests there.
- GLM-5.1 is $2.88/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- GLM-5.1 adds Reasoning, Function calling, and Tool use in local capability data.
- Provider overlap exists on Fireworks AI; start route-level A/B tests there.
- Gemma 3 12B Instruct is $2.88/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Reasoning, Function calling, and Tool use before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-01-01 | 2026-04-07 |
| Context window | 128k | 200k |
| Parameters | 12B | 754B total, 40B active |
| Architecture | decoder only | mixture of experts |
| License | Gemma | MIT |
| Knowledge cutoff | 2024-08 | 2025-11 |
Pricing and availability
| Pricing attribute | Gemma 3 12B Instruct | GLM-5.1 |
|---|---|---|
| Input price | $0.20/1M tokens | $0.98/1M tokens |
| Output price | $0.20/1M tokens | $3.08/1M tokens |
| Providers |
Capabilities
| Capability | Gemma 3 12B Instruct | GLM-5.1 |
|---|---|---|
| Vision | No | No |
| Multimodal | No | No |
| Reasoning | No | Yes |
| Function calling | No | Yes |
| Tool use | No | Yes |
| Structured outputs | No | Yes |
| Code execution | No | Yes |
| 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-5.1, function calling: GLM-5.1, tool use: GLM-5.1, structured outputs: GLM-5.1, and code execution: GLM-5.1. Both models share the core language-model surface, 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.
For cost, Gemma 3 12B Instruct lists $0.20/1M input and $0.20/1M output tokens on the cheapest tracked provider, while GLM-5.1 lists $0.98/1M input and $3.08/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Gemma 3 12B Instruct lower by about $1.41 per million blended tokens. Availability is 1 providers versus 5, so concentration risk also matters.
Choose Gemma 3 12B Instruct when provider fit and lower input-token cost are central to the workload. Choose GLM-5.1 when coding workflow support, larger context windows, 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.
FAQ
Which has a larger context window, Gemma 3 12B Instruct or GLM-5.1?
GLM-5.1 supports 200k tokens, while Gemma 3 12B Instruct supports 128k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Gemma 3 12B Instruct or GLM-5.1?
Gemma 3 12B Instruct is cheaper on tracked token pricing. Gemma 3 12B Instruct costs $0.20/1M input and $0.20/1M output tokens. GLM-5.1 costs $0.98/1M input and $3.08/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Gemma 3 12B Instruct or GLM-5.1 open source?
Gemma 3 12B Instruct is listed under Gemma. GLM-5.1 is listed under MIT. 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, Gemma 3 12B Instruct or GLM-5.1?
GLM-5.1 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, Gemma 3 12B Instruct or GLM-5.1?
GLM-5.1 has the clearer documented function calling signal in this comparison. If function calling is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Gemma 3 12B Instruct and GLM-5.1?
Gemma 3 12B Instruct is available on Fireworks AI. GLM-5.1 is available on Z.ai, OpenRouter, Fireworks AI, Vercel AI Gateway, and Novita AI. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-05-25. Data sourced from public model cards and provider documentation.