LLM Reference

Claude Opus 4.8 vs GLM-5.2

Claude Opus 4.8 (2026) and GLM-5.2 (2026) are frontier-tier reasoning models from Anthropic and Zhipu AI. Claude Opus 4.8 ships a 1m-token context window, while GLM-5.2 ships a 1m-token context window. On SWE-bench Pro, Claude Opus 4.8 leads by 7.1 pts. 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.

GLM-5.2 is ~257% cheaper at $1.40/1M; pay for Claude Opus 4.8 only for coding workflow support.

Decision scorecard

Local evidence first
SignalClaude Opus 4.8GLM-5.2
Best forreasoning-heavy apps, multimodal apps, and tool-calling agentsreasoning-heavy apps, tool-calling agents, and long-context analysis
Decision fitCoding, RAG, and AgentsCoding, RAG, and Agents
Context window1m1m
Cheapest output$25/1M tokens$4.40/1M tokens
Provider routes6 tracked1 tracked
Shared benchmarksSWE-bench Pro leader11 shared

Decision tradeoffs

Choose Claude Opus 4.8 when...
  • Claude Opus 4.8 holds a shared-benchmark lead on SWE-bench Pro, ahead by 7.1 points.
  • Claude Opus 4.8 has broader tracked provider coverage for fallback and route flexibility.
  • Claude Opus 4.8 uniquely exposes Vision, Multimodal, and Computer use in local model data.
  • Local decision data tags Claude Opus 4.8 for Coding, RAG, and Agents.
Choose GLM-5.2 when...
  • GLM-5.2 holds a shared-benchmark lead on Terminal-Bench 2.1, ahead by 8.1 points.
  • 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.

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

Claude Opus 4.8

$10,250

Cheapest tracked route/tier: Anthropic

GLM-5.2

$2,220

Cheapest tracked route/tier: OpenRouter

Estimated monthly gap: $8,030. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Claude Opus 4.8 -> 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, Multimodal, and Computer use before moving production traffic.
GLM-5.2 -> Claude Opus 4.8
  • Provider overlap exists on OpenRouter; start route-level A/B tests there.
  • Claude Opus 4.8 is $20.60/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • Claude Opus 4.8 adds Vision, Multimodal, and Computer use in local capability data.

Specs

Specification
Released2026-05-282026-06-13
Context window1m1m
Parameters—753B total, 40B active
ArchitectureDecoder OnlyMixture of Experts
LicenseProprietaryMITOSI-approved
OpennessProprietaryOpen source
WeightsNot releasedAvailable
CodeNot releasedUnknown
Commercial useCommercial use: conditionalCommercial use: permitted
Knowledge cutoff2026-01-

Pricing and availability

Pricing attributeClaude Opus 4.8GLM-5.2
Input price$5/1M tokens$1.40/1M tokens
Output price$25/1M tokens$4.40/1M tokens
Providers
AnthropicAWS BedrockGCP Vertex AIMicrosoft FoundryOpenRouterVercel AI Gateway
OpenRouter

Capabilities

CapabilityClaude Opus 4.8GLM-5.2
VisionYesNo
MultimodalYesNo
ReasoningYesYes
JSON / Tool useYesYes
Structured outputsYesYes
Code executionYesYes
IDE integrationNoNo
Computer useYesNo
Parallel agentsYesNo

Benchmarks

BenchmarkClaude Opus 4.8GLM-5.2
SWE-bench Pro69.262.1
Google-Proof Q&A93.691.2
Terminal-Bench 2.174.682.7
CursorBench63.851.5
GeneBench-Pro16.04.6
CursorBench62.351.5
CursorBench59.451.5
CursorBench58.051.5
MCP-Atlas82.276.8
CursorBench56.151.5
CursorBench53.151.5

Continue comparing

Model pages
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Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.