Gemini 3.8 Flash vs GLM 5.3 Flash
API pricing, context window and capabilities for Gemini 3.8 Flash 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 numbersGemini 3.8 Flash wins on Terminal-Bench. GLM 5.3 Flash wins on price and on intelligence.
Price
GLM 5.3 Flash
Terminal-Bench
Gemini 3.8 Flash
Intelligence
GLM 5.3 Flash
Context window
Tied
Key takeaways
who wins on what, from the published numbersGemini 3.8 Flash wins
- Supports audio
- Has web search
GLM 5.3 Flash wins
- Cheaper input ($0.75 vs $0.11 /1M)
- Cheaper output ($3.75 vs $0.35 /1M)
- Higher max output (66K vs 1M)
- More serving providers (5 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.
| Gemini 3.8 Flash | GLM 5.3 Flash | |
|---|---|---|
| Input $/1M | $0.75via Google | $0.11via Sail best |
| Output $/1M | $3.75via Google | $0.35via Sail best |
| Context window | 1M | 1M |
| Max output | 66K | 1M best |
| Serving providers | 5 | 13 best |
| Date | Released Sep 2, 2026 | Released Aug 26, 2026 |
Benchmarks
Benchmark scores, side by side| Gemini 3.8 Flash | GLM 5.3 Flash | |
|---|---|---|
| Intelligence | 40.9 | 41.8 best |
| Terminal-Bench | 88% best | 84% |
| GPQA Diamond | 95% best | 91% |
| Output speed | 145 t/s best | 67 t/s |
| Latency (TTFT) | 24.48s | 2.80s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Gemini 3.8 Flash
via Vertex AI
$7.50
GLM 5.3 Flash
via Sail
$0.90
Capabilities
feature support, side by side| Feature | Gemini 3.8 Flash | GLM 5.3 Flash |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | ✓ | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | — |
Related comparisons
Frequently asked questions
Which is cheaper, Gemini 3.8 Flash or GLM 5.3 Flash?
GLM 5.3 Flash is cheaper for input ($0.75 vs $0.11 per 1M tokens) from Sail. GLM 5.3 Flash is cheaper for output ($3.75 vs $0.35 per 1M tokens) from Sail.
What is the context window difference between Gemini 3.8 Flash and GLM 5.3 Flash?
Both Gemini 3.8 Flash and GLM 5.3 Flash have about a 1M-token context window.
How do Gemini 3.8 Flash and GLM 5.3 Flash compare on benchmarks?
On the tracked benchmarks, Gemini 3.8 Flash leads on Terminal-Bench, and GLM 5.3 Flash leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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