Claude Opus 5 vs GLM 5.3 Flash
API pricing, context window and capabilities for Claude Opus 5 and GLM 5.3 Flash, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersClaude Opus 5 wins on Terminal-Bench and on intelligence. GLM 5.3 Flash wins on price.
Price
GLM 5.3 Flash
Terminal-Bench
Claude Opus 5
Intelligence
Claude Opus 5
Context window
Tied
Key takeaways
who wins on what, from the published numbersClaude Opus 5 wins
- Has web search
GLM 5.3 Flash wins
- Cheaper input ($5.00 vs $0.11 /1M)
- Cheaper output ($25.00 vs $0.35 /1M)
- Higher max output (128K vs 1M)
- More serving providers (9 vs 13)
Cheaper overall
GLM 5.3 Flash
$0.11 + $0.35 /1M
Larger context
Tied
More providers
GLM 5.3 Flash
13 providers
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower.
| Claude Opus 5 | GLM 5.3 Flash | |
|---|---|---|
| Input $/1M | $5.00via Anthropic | $0.11via Sail best |
| Output $/1M | $25.00via Anthropic | $0.35via Sail best |
| Context window | 1M | 1M |
| Max output | 128K | 1M best |
| Serving providers | 9 | 13 best |
| Date | Released Jul 24, 2026 | Released Aug 26, 2026 |
Benchmarks
Benchmark scores, side by side| Claude Opus 5 | GLM 5.3 Flash | |
|---|---|---|
| Intelligence | 50.8 best | 41.8 |
| Terminal-Bench | 89% best | 84% |
| GPQA Diamond | 93% best | 91% |
| Output speed | 56 t/s | 67 t/s best |
| Latency (TTFT) | 107.27s | 2.80s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Claude Opus 5
via OpenRouter
$50
GLM 5.3 Flash
via Sail
$0.90
Capabilities
feature support, side by side| Feature | Claude Opus 5 | GLM 5.3 Flash |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | — |
Related comparisons
Frequently asked questions
Which is cheaper, Claude Opus 5 or GLM 5.3 Flash?
GLM 5.3 Flash is cheaper for input ($5.00 vs $0.11 per 1M tokens) from Sail. GLM 5.3 Flash is cheaper for output ($25.00 vs $0.35 per 1M tokens) from Sail.
What is the context window difference between Claude Opus 5 and GLM 5.3 Flash?
Both Claude Opus 5 and GLM 5.3 Flash have about a 1M-token context window.
How do Claude Opus 5 and GLM 5.3 Flash compare on benchmarks?
On the tracked benchmarks, Claude Opus 5 leads on Terminal-Bench, and Claude Opus 5 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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