Which is cheaper, DeepSeek V4.1 Flash 1017 and GPT-6.1 Terra?

DeepSeek V4.1 Flash 1017 has the lowest input price. Per 1M input tokens: DeepSeek V4.1 Flash 1017 from $0.10 and GPT-6.1 Terra from $1.00.

Which has the larger context window, DeepSeek V4.1 Flash 1017 and GPT-6.1 Terra?

GPT-6.1 Terra has the largest context window: DeepSeek V4.1 Flash 1017 1,048,576 tokens and GPT-6.1 Terra 1,050,000 tokens.

Can I switch between DeepSeek V4.1 Flash 1017 and GPT-6.1 Terra without changing my code?

Yes. All of them are served through FastRouter's OpenAI-compatible API, so switching is a change of the model parameter (deepseek/deepseek-v4.1-flash-1017, openai/gpt-6.1-terra).

DeepSeek V4.1 Flash 1017 vs GPT-6.1 Terra

Side-by-side pricing per provider, context window, benchmark scores and speed, all on one OpenAI-compatible API.

Estimate monthly cost for these models

DeepSeek V4.1 Flash 1017 DeepSeekdeepseek/deepseek-v4.1-flash-1017

GPT-6.1 Terra OpenAIopenai/gpt-6.1-terra

Creator

DeepSeek

OpenAI

Released

Oct 17, 2026

Oct 26, 2026

Context window

1.05M

Max output

944K

128K

Input / 1MLowest provider price

$0.10$0.10–$0.30 across 4

$1.00

Output / 1MLowest provider price

$0.29$0.29–$1.20 across 4

$5.00

Providers

IntelligenceArtificial Analysis index

32.5

51.0

Accepts

Text, Image

Text, Image, Files

Produces

Text

Tool calling

Yes

Structured output

Yes

Reasoning

Yes

DeepSeek V4.1 Flash 1017 vs GPT-6.1 Terra: summary

DeepSeek V4.1 Flash 1017 and GPT-6.1 Terra are both available through FastRouter's OpenAI-compatible API, so switching between them is a change of model id, not a new integration.

DeepSeek V4.1 Flash 1017, from DeepSeek, has a 1,048,576-token context window, costs from $0.10/1M input and $0.29/1M output tokens across 4 providers and scores 32.5 on the Artificial Analysis Intelligence Index.

GPT-6.1 Terra, from OpenAI, has a 1,050,000-token context window, costs $1.00/1M input and $5.00/1M output tokens and scores 51.0 on the Artificial Analysis Intelligence Index.

DeepSeek V4.1 Flash 1017 is the cheapest on input, 10× cheaper than the next model, GPT-6.1 Terra has the largest context window and GPT-6.1 Terra scores highest for intelligence.

Switch with one line

client = OpenAI(base_url="https://api.fastrouter.ai/api/v1", api_key="<FASTROUTER_API_KEY>") client.chat.completions.create(model="deepseek/deepseek-v4.1-flash-1017", messages=[...]) # or client.chat.completions.create(model="openai/gpt-6.1-terra", messages=[...])

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Benchmark scores sourced from ArtificialAnalysis