GPT-5.6 Lunavs.DeepSeek V4.1 Flash 1017

Which one is better?

DeepSeek V4.1 Flash 1017 is clearly ahead in the overall index and is cheaper too: GPT-5.6 Luna costs 1.3 times (input) and 2 times (output) as much per token.

IntelligenceOverall index, 0 to 100 · higher is better

GPT-5.6 Luna

Rank 32 to 41

DeepSeek V4.1 Flash 1017

Rank 14 to 22

SpeedTokens per second · higher is better

127

GPT-5.6 Luna

fairly fast

178

DeepSeek V4.1 Flash 1017

fast

PriceDollars per 1M tokens · lower is better

$0.45

GPT-5.6 Luna

cheap

$0.26

DeepSeek V4.1 Flash 1017

cheap

GPT-5.6 Luna

Subscription: Free to use at OpenAI (ChatGPT Free), more from €8 a month (ChatGPT Go). Through other providers from ≈ €1.06 a month (Command Code Go, with limited credits). 58 plans in Germany.
Via API: $0.20 input, $1.20 output per 1M tokens, cheaper since Oct 16, 2026 (before $0.22 and $1.32).
Note: There is a successor: GPT-6 Luna (rank 31 to 39, $0.10 input, $0.50 output).

DeepSeek V4.1 Flash 1017

Subscription: No DeepSeek subscription includes this model. Through other providers from ≈ €6.36 a month (Token Plan Individual Lite, with limited credits). 7 plans in Germany.
Via API: $0.15 input, $0.60 output per 1M tokens according to the provider; the price index has listed it at $0.30 and $1 since Oct 26, 2026.

Overall index with data through Oct 29, 2026 · Prices from Oct 29, 2026 · Speed: measured by Artificial Analysis · Subscriptions as of Oct 24, 2026 · Subscription prices incl. VAT

Where is the difference?

Values from 0 to 100 per task area. We only name a winner when the gap is large enough and there are enough tests.

GPT-5.6 Luna ahead: 0DeepSeek V4.1 Flash 1017 ahead: 5level: 1too little data: 4of 10 areas

AreaGPT-5.6 LunaDeepSeek V4.1 Flash 10170 to 100, higher is betterResult

Areas in the overall index

CodingDeepSeek V4.1 Flash 1017 ahead4472

Reasoninglevel4645

Mathematicsonly GPT-5.6 Luna has a score38not enough data

Knowledgetoo little data2233

AgentsDeepSeek V4.1 Flash 1017 ahead4475

Generalonly GPT-5.6 Luna has a score27not enough data

MultimodalDeepSeek V4.1 Flash 1017 ahead2855

Specialist fields

FinanceDeepSeek V4.1 Flash 1017 ahead4769

LegalDeepSeek V4.1 Flash 1017 ahead3976

Healthonly GPT-5.6 Luna has a score29not enough data

Show 2 more areas that do not count toward the overall index

AreaGPT-5.6 LunaDeepSeek V4.1 Flash 10170 to 100, higher is betterResult

Cybersecurityonly GPT-5.6 Luna has a score56not enough data

Productivityonly GPT-5.6 Luna has a score29not enough data

See for yourself: same task, one attempt

The same prompt for both models. We show the latest attempt without fixes; it does not count toward the overall index.

Pelican on a bicycle

A community classic for free-form SVG drawing.

GPT-5.6 Luna

Reasoning (requested): high

Current attempt

Run date: Sep 7, 2026
API provider: openrouter
Requested API model: openai/gpt-5.6-luna
API model reported in response: openai/gpt-5.6-luna
Reasoning setting: high
Pinned endpoint: OpenAI | openai/gpt-5.6-luna-20260709
Temperature: Provider default
Token limit including reasoning: 8,192 tokens
Test protocol: community-visual-tests-v1
Technical checks: Passed, not a quality rating
Response time: 49.9 s

Visually reviewed. This individual test does not establish overall model quality.

DeepSeek V4.1 Flash 1017

Not tested yet

Prompt and test conditions

Generate an SVG of a pelican riding a bicycle

Token limit including reasoning: 8,192 tokens

Task origin (Simon Willison)

SVG short test

There is no shared test round for this selection. Results from different rounds are not mixed.

All data side by side

The better value is bold. For the overall index only when the gap is clear.

Metric	GPT-5.6 Luna	DeepSeek V4.1 Flash 1017
Intelligence
Overall index0 to 100, higher is better	36	64
Rank	Rank 32 to 41 of 95	Rank 14 to 22 of 95
Price per 1M tokens
Inputwhat you send	$0.20above 272,000 tokens: $0.40	$0.15
Outputwhat the model writes	$1.20above 272,000 tokens: $1.80	$0.60
Speed
Tokens per second	127	178
Technical
Context windowhow much text the model reads at once	1.05 M tokens≈ 1,580 A4 pages	1.05 M tokens≈ 1,570 A4 pages
Knowledge cutoff	Feb 16, 2026	n/a
Released	Jul 9, 2026	Oct 17, 2026
Availability	Active	Open Source
Open weights	no	yes

DeepSeek V4.1 Flash 1017: At peak times (Mon, Tue, Wed, Thu, Fri, 01:00-04:00 UTC; Mon, Tue, Wed, Thu, Fri, 06:00-10:00 UTC) the price is $0.30 input and $1.20 output per 1M tokens. The table shows the off-peak price.
DeepSeek V4.1 Flash 1017, Time-based API pricing: Off peak: $0.15 input, $0.60 output, and $0.003 cached input. Weekdays UTC 01:00-04:00 and 06:00-10:00: $0.30, $1.20, and $0.006. Chinese public holidays are excluded. Source

Prices without caching or batch discounts · Page count as a rule of thumb from Artificial Analysis

Shared benchmarks

Single results from the same benchmark version, task and metric. A value is bold only with the same test setup and a clear gap.

A: GPT-5.6 LunaB: DeepSeek V4.1 Flash 1017

Code MigrationOverall · higher is betterTest setup not documented as identical44.6%44.2%Vals AIAs of 10/18/2026

CritPt v2Overall · higher is better20.6%24.0%Artificial AnalysisAs of 10/29/2026

EMBOverall · higher is betterTest setup not documented as identical67.1%61.8%Vals AIAs of 10/20/2026

Finance Agent (v2)Overall · higher is betterTest setup not documented as identical55%57%Vals AIAs of 10/20/2026

GDPval-AAOverall · higher is better1,468.83 elo1,745.77 eloArtificial AnalysisAs of 10/29/2026

Legal Research BenchOverall · All-pass · higher is betterTest setup not documented as identical36.5%45.2%Vals AIAs of 10/26/2026

MMMU-ProOverall · higher is better78.6%80.6%Artificial AnalysisAs of 10/29/2026

Tax Agent BenchOverall · higher is betterTest setup not documented as identical24.8%44.4%Vals AIAs of 10/26/2026

Terminal-Bench 4.0Overall · higher is betterTest setup not documented as identical11.6%31.8%Vals AIAs of 10/26/2026

Vibe Code Bench v1.1Overall · higher is betterTest setup not documented as identical77.1%87.7%Vals AIAs of 10/26/2026

Show 54 more benchmarks

Code MigrationCLI · higher is betterTest setup not documented as identical36.1%35.6%Vals AIAs of 10/18/2026

EMBComps · higher is betterTest setup not documented as identical54.6%49.8%Vals AIAs of 10/20/2026

Finance Agent (v2)Adjustments · higher is betterTest setup not documented as identical52%58.4%Vals AIAs of 10/20/2026

Legal Research BenchAdministrative / Regulatory · All-pass · higher is betterTest setup not documented as identical48.5%59.1%Vals AIAs of 10/26/2026

Tax Agent BenchControversy & Precedence Analysis · higher is betterTest setup not documented as identical10%23.3%Vals AIAs of 10/26/2026

Terminal-Bench 4.0Hardware · higher is betterTest setup not documented as identical0%6.7%Vals AIAs of 10/26/2026

Code MigrationCOBOL · higher is betterTest setup not documented as identical70%70%Vals AIAs of 10/18/2026

EMBDataroom · higher is betterTest setup not documented as identical83%82.8%Vals AIAs of 10/20/2026

Finance Agent (v2)All-Pass · higher is betterTest setup not documented as identical43.3%45.2%Vals AIAs of 10/20/2026

Legal Research BenchAdministrative / Regulatory · Weighted partial credit · higher is betterTest setup not documented as identical87.5%91.3%Vals AIAs of 10/26/2026

Tax Agent BenchControversy & Precedence Analysis · higher is betterTest setup not documented as identical61.2%73.2%Vals AIAs of 10/26/2026

Terminal-Bench 4.0Media · higher is betterTest setup not documented as identical0%25%Vals AIAs of 10/26/2026

Code MigrationCode Quality · higher is betterTest setup not documented as identical3.195 / 53.992 / 5Vals AIAs of 10/18/2026

EMBDCF · higher is betterTest setup not documented as identical60.5%53%Vals AIAs of 10/20/2026

Finance Agent (v2)Comparables · higher is betterTest setup not documented as identical48.3%47.5%Vals AIAs of 10/20/2026

Legal Research BenchBusiness & Commercial · All-pass · higher is betterTest setup not documented as identical32.6%44.2%Vals AIAs of 10/26/2026

Tax Agent BenchCurrent & Temporal Analysis · higher is betterTest setup not documented as identical33%56.4%Vals AIAs of 10/26/2026

Terminal-Bench 4.0ML · higher is betterTest setup not documented as identical18.2%42.4%Vals AIAs of 10/26/2026

EMBLBO · higher is betterTest setup not documented as identical59.3%57.8%Vals AIAs of 10/20/2026

Finance Agent (v2)Disclosure Analysis · higher is betterTest setup not documented as identical62.8%66.3%Vals AIAs of 10/20/2026

Legal Research BenchBusiness & Commercial · Weighted partial credit · higher is betterTest setup not documented as identical87.3%87.8%Vals AIAs of 10/26/2026

Tax Agent BenchCurrent & Temporal Analysis · higher is betterTest setup not documented as identical60.1%75%Vals AIAs of 10/26/2026

Terminal-Bench 4.0Operations · higher is betterTest setup not documented as identical7.4%18.5%Vals AIAs of 10/26/2026

EMBM&A · higher is betterTest setup not documented as identical69.6%62.3%Vals AIAs of 10/20/2026

Finance Agent (v2)Earnings Analysis · higher is betterTest setup not documented as identical74.9%75.3%Vals AIAs of 10/20/2026

Legal Research BenchCivil Litigation · All-pass · higher is betterTest setup not documented as identical25.9%37%Vals AIAs of 10/26/2026

Tax Agent BenchFact-Pattern Analysis · higher is betterTest setup not documented as identical25.6%55.8%Vals AIAs of 10/26/2026

Terminal-Bench 4.0Science · higher is betterTest setup not documented as identical14.3%38.1%Vals AIAs of 10/26/2026

EMBMisc · higher is betterTest setup not documented as identical70.1%60.9%Vals AIAs of 10/20/2026

Finance Agent (v2)Financial Modeling · higher is betterTest setup not documented as identical21.6%22.8%Vals AIAs of 10/20/2026

Legal Research BenchCivil Litigation · Weighted partial credit · higher is betterTest setup not documented as identical84.8%84.9%Vals AIAs of 10/26/2026

Tax Agent BenchFact-Pattern Analysis · higher is betterTest setup not documented as identical59.6%72.5%Vals AIAs of 10/26/2026

Terminal-Bench 4.0Security · higher is betterTest setup not documented as identical6.7%26.7%Vals AIAs of 10/26/2026

EMBOperating · higher is betterTest setup not documented as identical72.7%66.1%Vals AIAs of 10/20/2026

Finance Agent (v2)General Qualitative Analysis · higher is betterTest setup not documented as identical66.6%74.1%Vals AIAs of 10/20/2026

Legal Research BenchConstitutional / Civil Rights · All-pass · higher is betterTest setup not documented as identical34.2%42.1%Vals AIAs of 10/26/2026

Tax Agent BenchForms & Filings · higher is betterTest setup not documented as identical13.3%33.3%Vals AIAs of 10/26/2026

Terminal-Bench 4.0Software · higher is betterTest setup not documented as identical14.8%37%Vals AIAs of 10/26/2026

EMBScratch · higher is betterTest setup not documented as identical68.8%68.5%Vals AIAs of 10/20/2026

Finance Agent (v2)General Quantitative Analysis · higher is betterTest setup not documented as identical75.2%79.2%Vals AIAs of 10/20/2026

Legal Research BenchConstitutional / Civil Rights · Weighted partial credit · higher is betterTest setup not documented as identical86.2%86.6%Vals AIAs of 10/26/2026

Tax Agent BenchForms & Filings · higher is betterTest setup not documented as identical58.5%79.4%Vals AIAs of 10/26/2026

EMBTemplate · higher is betterTest setup not documented as identical64.7%54.7%Vals AIAs of 10/20/2026

Finance Agent (v2)Market Analysis · higher is betterTest setup not documented as identical64.9%62.7%Vals AIAs of 10/20/2026

Legal Research BenchCriminal · All-pass · higher is betterTest setup not documented as identical29.8%35.1%Vals AIAs of 10/26/2026

Tax Agent BenchNumbers & Calculations · higher is betterTest setup not documented as identical30%45.7%Vals AIAs of 10/26/2026

Finance Agent (v2)Precedents · higher is betterTest setup not documented as identical29.1%26.5%Vals AIAs of 10/20/2026

Legal Research BenchCriminal · Weighted partial credit · higher is betterTest setup not documented as identical82.2%83.2%Vals AIAs of 10/26/2026

Tax Agent BenchNumbers & Calculations · higher is betterTest setup not documented as identical71.8%79.5%Vals AIAs of 10/26/2026

Legal Research BenchFamily · All-pass · higher is betterTest setup not documented as identical18.2%27.3%Vals AIAs of 10/26/2026

Tax Agent BenchRule & Source Lookup · higher is betterTest setup not documented as identical36.7%46.7%Vals AIAs of 10/26/2026

Legal Research BenchFamily · Weighted partial credit · higher is betterTest setup not documented as identical78.4%74.2%Vals AIAs of 10/26/2026

Tax Agent BenchRule & Source Lookup · higher is betterTest setup not documented as identical54.3%70.8%Vals AIAs of 10/26/2026

Legal Research BenchHealth · All-pass · higher is betterTest setup not documented as identical70%66.7%Vals AIAs of 10/26/2026

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Compare GPT-5.6 Luna and DeepSeek V4.1 Flash 1017 with other leading models.

View the complete LLM comparison

GPT-5.6 Lunavs.DeepSeek V4.1 Flash 1017

GPT-5.6 Luna

DeepSeek V4.1 Flash 1017

Where is the difference?

See for yourself: same task, one attempt

Pelican on a bicycle

All data side by side

Shared benchmarks

Compare another matchup

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