Gemini Omni 1.1 Flash vs GLM 5.3

Practical read: GLM 5.3 costs about a fifth as much and reads eight times more context. One API key runs both.

No card required. Start with 1 million free tokens.

Side by side:

Google: Gemini Omni 1.1 Flash compared with Z.ai: GLM 5.3
Attribute	Gemini Omni 1.1 Flash `google/gemini-omni-1.1-flash`	GLM 5.3 `z-ai/glm-5.3`
Price, 1M in + out	$11.08 Google AI Studio, cheapest route	$2.11 Pearl Research Labs, cheapest route
Best for		Low cost and long documents
Input / output, 1M	$1.58 / $9.50	$0.53 / $1.58
Cached input	Not published	$0.03165/1M to $0.94739/1M
Context window	131K 131,072 tokens	1.05M 1,048,576 tokens
First token, p50	Measuring	0.61 s via Sail Research
Throughput	Measuring	228 tok/s via Boundless
AI IQ	Unrated	IQ 124 #30 on AI IQ
Provider routes	1	33 with failover
Privacy	Varies by provider	Confidential E2EE and zero retention route
Recent route uptime range	not enough data	100.00%
Publisher	Google AI Studio	Z.AI
Modes	chat	chat
More detail	Overview	Overview Pricing Providers

Price adds one million input and one million output tokens on the cheapest route. Prices and speed change: see the monthly reports and run a small eval before you choose a default.

Test both with your agent

Paste this into Claude Code, Cursor or any coding agent.

Compare Gemini Omni 1.1 Flash and GLM 5.3 in this project through TrustedRouter.

1. Read https://trustedrouter.com/docs/llms.txt
2. Point the OpenAI-compatible client at
   https://api.trustedrouter.com/v1 and read the key from
   TRUSTEDROUTER_API_KEY.
3. Run our eval prompts on google/gemini-omni-1.1-flash, then on z-ai/glm-5.3.
4. Show me cost, latency and quality side by side before changing the default.

import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.trustedrouter.com/v1",
    api_key=os.environ["TRUSTEDROUTER_API_KEY"],
)
for model in ("google/gemini-omni-1.1-flash", "z-ai/glm-5.3"):
    response = client.chat.completions.create(
        model=model,
        messages=[{"role": "user", "content": "What is the capital of France?"}],
    )
    print(model, response.choices[0].message.content)

for model in google/gemini-omni-1.1-flash z-ai/glm-5.3; do
  curl https://api.trustedrouter.com/v1/chat/completions \
    -H "Authorization: Bearer $TRUSTEDROUTER_API_KEY" \
    -H "Content-Type: application/json" \
    -d "{\"model\": \"$model\", \"messages\": [{\"role\": \"user\", \"content\": \"What is the capital of France?\"}]}"
done

Your agent will need an API key.

Questions

Which should I use, Google: Gemini Omni 1.1 Flash or Z.ai: GLM 5.3?

Z.ai: GLM 5.3 has the lower published input-plus-output rate, more Credits provider routes and the larger context window. There is not enough recent probe data to compare speed.

Is Google: Gemini Omni 1.1 Flash or Z.ai: GLM 5.3 cheaper?

The current cheapest TrustedRouter route is $11.0775/1M for Google: Gemini Omni 1.1 Flash and $2.11/1M for Z.ai: GLM 5.3. The comparison uses current catalog prices and updates as provider pricing changes.

Is Google: Gemini Omni 1.1 Flash or Z.ai: GLM 5.3 faster?

Current measured p50 time to first token is not enough data for Google: Gemini Omni 1.1 Flash and 611 ms for Z.ai: GLM 5.3. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test Google: Gemini Omni 1.1 Flash and Z.ai: GLM 5.3 with the same API?

Yes. Use the same OpenAI-compatible TrustedRouter base URL and API key, then change only the model id between google/gemini-omni-1.1-flash and z-ai/glm-5.3. This makes side-by-side evals possible without maintaining two provider integrations.

More comparisons

All comparisons

Try Gemini Omni 1.1 Flash and GLM 5.3 with one key.

TrustedRouter is useful when you know the model you want, but still need provider rollover, budget limits, usage records, and a prompt path you can verify.

No card required. Start with 1 million free tokens.