Which has the larger context window, DeepSeek V4.1 Flash 1017 and GPT-6 Luna?

DeepSeek V4.1 Flash 1017 has the largest context window: DeepSeek V4.1 Flash 1017 1,048,576 tokens and GPT-6 Luna 400,000 tokens.

Can I switch between DeepSeek V4.1 Flash 1017 and GPT-6 Luna 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-luna).

DeepSeek V4.1 Flash 1017 vs GPT-6 Luna

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 Luna OpenAIopenai/gpt-6-luna

Creator

DeepSeek

OpenAI

Released

Oct 17, 2026

Sep 22, 2026

Context window

1.05M

400K

Max output

944K

128K

Input / 1MLowest provider price

$0.10$0.10–$0.30 across 4

$0.10

Output / 1MLowest provider price

$0.29$0.29–$1.20 across 4

$0.50

Providers

IntelligenceArtificial Analysis index

32.5

27.8

Accepts

Text, Image

Files, Image, Text

Produces

Text

Tool calling

Yes

Structured output

Yes

Reasoning

Yes

DeepSeek V4.1 Flash 1017 vs GPT-6 Luna: summary

DeepSeek V4.1 Flash 1017 and GPT-6 Luna 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 Luna, from OpenAI, has a 400,000-token context window, costs $0.10/1M input and $0.50/1M output tokens and scores 27.8 on the Artificial Analysis Intelligence Index.

DeepSeek V4.1 Flash 1017 has the largest context window and DeepSeek V4.1 Flash 1017 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-luna", messages=[...])

Full API docs

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More comparisons

Benchmark scores sourced from ArtificialAnalysis