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DeepSeek V4.1 Flash 1017 vs o3

Practical read: DeepSeek V4.1 Flash 1017 costs under a tenth as much and reads five times more context. One API key runs both.

No card required. Start with 1 million free tokens.

Side by side:

DeepSeek: DeepSeek V4.1 Flash 1017 compared with OpenAI: o3
Attribute DeepSeek V4.1 Flash 1017 deepseek/deepseek-v4.1-flash-1017 o3 openai/o3
Price, 1M in + out $0.16 Engy, cheapest route $10.55 OpenAI, cheapest route
Best for Low cost and long documents
Input / output, 1M $0.032 / $0.13 $2.11 / $8.44
Cached input $0.01/1M to $0.131875/1M $0.5275/1M
Context window 1.05M 1,048,576 tokens 200K 200,000 tokens
First token, p50 0.95 s via Sail Research Measuring
AI IQ IQ 128 #19 on AI IQ IQ 103 #112 on AI IQ
Provider routes 19 with failover 1
Privacy Confidential E2EE and zero retention route Zero retention route
Recent route uptime range 99.15% to 100.00% not enough data
Publisher DeepSeek OpenAI
Modes chat chat
More detail

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 DeepSeek V4.1 Flash 1017 and o3 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 deepseek/deepseek-v4.1-flash-1017, then on openai/o3.
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 ("deepseek/deepseek-v4.1-flash-1017", "openai/o3"):
    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 deepseek/deepseek-v4.1-flash-1017 openai/o3; 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, DeepSeek: DeepSeek V4.1 Flash 1017 or OpenAI: o3?

DeepSeek V4.1 Flash 1017 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 DeepSeek: DeepSeek V4.1 Flash 1017 or OpenAI: o3 cheaper?

The current cheapest TrustedRouter route is $0.15825/1M for DeepSeek: DeepSeek V4.1 Flash 1017 and $10.55/1M for OpenAI: o3. The comparison uses current catalog prices and updates as provider pricing changes.

Is DeepSeek: DeepSeek V4.1 Flash 1017 or OpenAI: o3 faster?

Current measured p50 time to first token is 946 ms for DeepSeek: DeepSeek V4.1 Flash 1017 and not enough data for OpenAI: o3. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test DeepSeek: DeepSeek V4.1 Flash 1017 and OpenAI: o3 with the same API?

Yes. Use the same OpenAI-compatible TrustedRouter base URL and API key, then change only the model id between deepseek/deepseek-v4.1-flash-1017 and openai/o3. This makes side-by-side evals possible without maintaining two provider integrations.

More comparisons

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Try DeepSeek V4.1 Flash 1017 and o3 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.

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