Claude Opus 4.5 (2025) and GLM-5.2 (2026) are frontier-tier reasoning models from Anthropic and Zhipu AI. Claude Opus 4.5 ships a 200k-token context window, while GLM-5.2 ships a 1M-token context window. On SWE-bench Pro, GLM-5.2 leads by 20.3 points. On pricing, GLM-5.2 costs $1.40/1M input tokens versus $5/1M 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.
Decision Scorecard
Local evidence first.
| Signal | Claude Opus 4.5 | GLM-5.2 | How to read it |
|---|---|---|---|
| Best for | Reasoning-heavy apps, multimodal apps, and tool-calling agents | Reasoning-heavy apps, tool-calling agents, and long-context analysis | Use-case synthesis from product type, capability flags, context, and provider data. |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents | Primary workload tags from local decision data. |
| Context window | 200k | 1m | Higher is better when prompts, retrieval chunks, or transcripts are large. |
| Cheapest output | $25/1M tokens | $4.40/1M tokens | Cheapest tracked provider route; verify your exact region and tier. |
| Provider routes | 6 tracked | 1 tracked | Broader coverage can reduce vendor lock-in and fallback risk. |
| Shared benchmarks | 2 shared | SWE-bench Pro leader | Visible benchmark lead is 20.3 points on SWE-bench Pro. |
Decision Tradeoffs
Choose Claude Opus 4.5 when...
- Claude Opus 4.5 has broader tracked provider coverage for fallback and procurement flexibility.
- Claude Opus 4.5 uniquely exposes Vision and Multimodal in local model data.
- Local decision data tags Claude Opus 4.5 for Coding, RAG, and Agents.
Choose GLM-5.2 when...
- GLM-5.2 holds a shared-benchmark lead on SWE-bench Pro, ahead by 20.3 points.
- GLM-5.2 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- GLM-5.2 has the lower cheapest tracked output price at $4.40/1M tokens.
- Local decision data tags GLM-5.2 for Coding, RAG, and Agents.
Pricing at a Glance
Monthly Cost at Traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Lower Estimate — GLM-5.2
Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch Friction
Claude Opus 4.5 → GLM-5.2
Provider overlap exists on OpenRouter; start route-level A/B tests there. GLM-5.2 is $20.60/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts. Check replacement coverage for Vision and Multimodal before moving production traffic.
GLM-5.2 → Claude Opus 4.5
Provider overlap exists on OpenRouter; start route-level A/B tests there. Claude Opus 4.5 is $20.60/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend. Claude Opus 4.5 adds Vision and Multimodal in local capability data.
So Yeah, Here's the Deal
GLM-5.2 is ~257% cheaper at $1.40/1M. Pay for Claude Opus 4.5 only for coding workflow support where the 20.3-point SWE-bench Pro lead actually matters to your use case. If your workload is standard coding, RAG, or agent tasks, GLM-5.2 handles it at 1/5 the cost. If you need multimodal input, vision, or the broadest provider coverage, Opus 4.5 is the safer bet.
