Claude Opus 5 vs GLM-5.3-FlashX-Legal
Claude Opus 5 and GLM-5.3-FlashX-Legal are closely matched at 53.4 and 41.5 on the LLM Stats Score. GLM-5.3-FlashX-Legal is 16.9x cheaper per token.
Anthropic · Zhipu AI · Updated for 2026
Which is better?
Claude Opus 5 and GLM-5.3-FlashX-Legal are closely matched on the overall LLM Stats Score at 53.4 and 41.5.
In the 1 individual benchmarks reported for both models, GLM-5.3-FlashX-Legal wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, GLM-5.3-FlashX-Legal is roughly 16.9x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Claude Opus 5
- you want predictable pricing at $5.00/M input and $25.00/M output
Choose GLM-5.3-FlashX-Legal
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
- cost matters — it's about 16.9x cheaper per token
- you want the most recent training data — it shipped Oct 2026
At a glance
The differences that matter most.
Individual benchmarks
14 reported for Claude Opus 5 · 1 for GLM-5.3-FlashX-Legal
Claude Opus 5 outperforms in 0 benchmarks, while GLM-5.3-FlashX-Legal is better at 1 benchmark (Legal Agent Benchmark).
GLM-5.3-FlashX-Legal significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Opus 5 ($5.00/1M tokens) is 13.5x more expensive than GLM-5.3-FlashX-Legal ($0.37/1M tokens).
For output processing, Claude Opus 5 ($25.00/1M tokens) is 20.0x more expensive than GLM-5.3-FlashX-Legal ($1.25/1M tokens).
In conclusion, Claude Opus 5 is more expensive than GLM-5.3-FlashX-Legal.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Both models have the same input context window of 1,000,000 tokens. GLM-5.3-FlashX-Legal can generate longer responses up to 131,072 tokens, while Claude Opus 5 is limited to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Claude Opus 5 and GLM-5.3-FlashX-Legal support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Opus 5
GLM-5.3-FlashX-Legal
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Claude Opus 5 was released on 2026-07-24, while GLM-5.3-FlashX-Legal was released on 2026-10-12.
GLM-5.3-FlashX-Legal is 3 months newer than Claude Opus 5.
Jul 24, 2026
3 months ago
Oct 12, 2026
3 weeks ago
2mo newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Claude Opus 5 is available from Anthropic, DeepInfra. GLM-5.3-FlashX-Legal is available from ZAI.
Claude Opus 5
GLM-5.3-FlashX-Legal
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Opus 5 and GLM-5.3-FlashX-Legal side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Opus 5 vs GLM-5.3-FlashX-Legal.