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AI model comparison

GPT-6.1 Terra vs DeepSeek V4.1 Flash 1017

Side by side comparison of GPT-6.1 Terra and DeepSeek V4.1 Flash 1017 on pricing, benchmark scores, context window, and more.

GPT-6.1 Terra is the mid-tier model in OpenAI's GPT-6.1 series, priced below GPT-6.1 Sol.

Input / 1M
$1
Output / 1M
$5
Context
1.05M

DeepSeek V4.1 Flash 1017 is the October 17, 2026 snapshot of DeepSeek V4.1 Flash, served by DeepSeek under the `deepseek-flash` API model name.

Input / 1M
$0.15
Output / 1M
$0.60
Context
1.05M

Comparing image generators? Compare image models

At a glance

Quick verdict

How the two models stack up on the things people ask about most.

Lower price

deepseek logo

DeepSeek V4.1 Flash 1017

7.5x cheaper for a typical chat

Higher intelligence score

Not available

Not enough benchmark data

Larger context window

openai logo

GPT-6.1 Terra

1.05M vs 1.05M tokens

Newer release

openai logo

GPT-6.1 Terra

Released October 26, 2026

Benchmarks

Benchmark scores

Independent scores from Artificial Analysis. Higher is better.

Intelligence index

openai logoGPT-6.1 Terra51
deepseek logoDeepSeek V4.1 Flash 1017Not available

Coding index

openai logoGPT-6.1 TerraNot available
deepseek logoDeepSeek V4.1 Flash 1017Not available

Agentic index

openai logoGPT-6.1 TerraNot available
deepseek logoDeepSeek V4.1 Flash 1017Not available

Pricing

GPT-6.1 Terra vs DeepSeek V4.1 Flash 1017 API pricing

Per-token API rates. Cheaper option highlighted.

Metricopenai logoGPT-6.1 Terradeepseek logoDeepSeek V4.1 Flash 1017
Input tokensPer 1M tokens$1$0.15
Output tokensPer 1M tokens$5$0.60
Cached input (read)Per 1M tokens$0.05$0.00
Cache writePer 1M tokens$1.25Not available
Long-context pricingPer 1M tokens, for very long prompts$2 in / $7.50 out above 272KSame rate at any length
Web searchPer request$0.01Not available

What it costs in practice

Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.

Chat message

2K in, 500 out

openai logoGPT-6.1 Terra$4.50
deepseek logoDeepSeek V4.1 Flash 1017$0.60

Coding task

30K in, 4K out

openai logoGPT-6.1 Terra$50$21.50 cached
deepseek logoDeepSeek V4.1 Flash 1017$6.90$2.49 cached

Long document summary

150K in, 2K out

openai logoGPT-6.1 Terra$160$17.50 cached
deepseek logoDeepSeek V4.1 Flash 1017$23.70$1.65 cached

Specs

Context window and capabilities

How much each model can read, how much it can write, and what it accepts as input.

Metricopenai logoGPT-6.1 Terradeepseek logoDeepSeek V4.1 Flash 1017
Context window1.05M tokens1.05M tokens
Max output128K tokens393K tokens
Input typesFile, Image, TextImage, Text
Output typesTextText
Reasoning effort levelsMax, Extra high, High, Medium, Low, NoneMax, High, Low, None
Default reasoning effortMediumHigh
Release dateOctober 26, 2026October 17, 2026

Features

Supported features

API features available for each model.

Metricopenai logoGPT-6.1 Terradeepseek logoDeepSeek V4.1 Flash 1017
Tool callingSupportedSupported
Structured outputsSupportedSupported
JSON modeSupportedSupported
ReasoningSupportedSupported
TemperatureNot supportedSupported
Stop sequencesNot supportedSupported
Deterministic seedSupportedSupported
Verbosity controlSupportedNot supported

Our take

DeepSeek V4.1 Flash 1017 is 7.5x cheaper for a typical chat. GPT-6.1 Terra has the larger context window (1.05M vs 1.05M tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.

FAQ

Frequently asked questions

Is GPT-6.1 Terra or DeepSeek V4.1 Flash 1017 cheaper?

DeepSeek V4.1 Flash 1017 is cheaper for a typical chat (2K input tokens and 500 output tokens). DeepSeek V4.1 Flash 1017 costs $0.15 per 1M input tokens and $0.60 per 1M output tokens, while GPT-6.1 Terra costs $1 per 1M input tokens and $5 per 1M output tokens.

Which has a bigger context window, GPT-6.1 Terra or DeepSeek V4.1 Flash 1017?

GPT-6.1 Terra supports up to 1.05M tokens of context, compared with 1.05M for DeepSeek V4.1 Flash 1017.

Can I use GPT-6.1 Terra and DeepSeek V4.1 Flash 1017 at the same time?

Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see GPT-6.1 Terra and DeepSeek V4.1 Flash 1017 answer side by side and keep the better response.

openai logodeepseek logo

Why choose? Ask both.

Send one prompt to GPT-6.1 Terra and DeepSeek V4.1 Flash 1017 at the same time. Compare the answers side by side and keep the best one.

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