Model decision surface

Compare AI models

Start with Claude Opus 5.5 and GLM 5.3 Flash, or choose any two current ranked language models. Compare capability evidence, price, context, provider availability, and weight access without pretending one field decides every use case.

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Current public data

Claude Opus 5.5 vs GLM 5.3 Flash

Live dataset updated 9/22/2026, 10:37:09 PM UTC

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Factual comparison of Claude Opus 5.5 and GLM 5.3 Flash
Field	Claude Opus 5.5 Anthropic	GLM 5.3 Flash Z.ai
ModelCap position	#1	#14
Index score	98.6	81.9
Evidence	Measured2 public benchmark observations across 2 boards	Measured4 public benchmark observations across 4 boards
Input / 1M	$4.00	$0.15
Output / 1M	$20.00	$0.50
Pricing status	fresh	fresh
Context	1M	1.3M
Providers	5	30
Weight access	API only	Open weights

Decision facts

Claude Opus 5.5 is #1; GLM 5.3 Flash is #14 on the same current language board.
Index scores are 98.6 for Claude Opus 5.5 and 81.9 for GLM 5.3 Flash. Their published uncertainty intervals overlap, so the rank difference alone does not establish a reliable capability advantage for your workload.
Both positions use Measured evidence.
Listed output price per 1M tokens is $20.00 for Claude Opus 5.5 and $0.50 for GLM 5.3 Flash. For 1,000 requests with 2,000 input and 500 output tokens each (2M input + 0.5M output), the listed-rate estimate is $18.00 for Claude Opus 5.5 versus $0.55 for GLM 5.3 Flash. GLM 5.3 Flash costs 96.9% less in this scenario. This excludes caching, batch discounts, prompt-length tiers, tool charges and retries; verify the selected endpoint before budgeting.
Published context is 1,000,000 tokens for Claude Opus 5.5 and 1,310,720 for GLM 5.3 Flash.
Weight access differs: Claude Opus 5.5 is none; GLM 5.3 Flash is open.
ModelCap currently lists 5 providers for Claude Opus 5.5 and 30 for GLM 5.3 Flash.

These are separate published fields, not a synthetic winner. ModelCap does not collapse price, access, context, and capability evidence into a hidden recommendation score.

Popular comparisons

Each comparison page is a permanent, shareable URL with the same live figures as this tool: ModelCap Index position, API pricing, context window, provider count, weight access and every shared benchmark board.