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Home/GPT-5.6 Luna vs DeepSeek V4-Flash
Winner: GPT-5.6 LunaOpenAI vs DeepSeek

GPT-5.6 Luna vs DeepSeek V4-Flash

GPT-5.6 Luna wins on coding (88 vs 87) and writing quality. DeepSeek V4-Flash wins on price ($0.14 vs $0.2/1M input). For most workflows, GPT-5.6 Luna is the stronger default — best budget model from a frontier lab — near-frontier scores at commodity price.

Last verified Aug 6, 2026/Model data modified Aug 6, 2026
Rankings refresh dailyScored on 6 criteriaNo paid rankings
OpenAIBudget
Input cost
$0.20/1M
Context
1.1M tokens
Speed
Fast

Clear recommendation block

The shortest way to see the safest default, the lower-cost option, and the specialist pick before you read deeper.

Best overall model

GPT-5.6 Luna

View
Why this recommendation

GPT-5.6 Luna is the safest overall answer here when you want the strongest default instead of the lowest list price.

OpenAIBudget
Best for
Cheap high-throughput summarization, drafting, and routine agent steps
Price
$0.20/1M
Context
1.1M tokens
Best budget model

Mistral: Mistral Nemo

View
Why this recommendation

Mistral: Mistral Nemo is the lower-cost option to start with when you still need useful output at scale.

MistralBudget
Best for
Teams needing a cheap, fast, multilingual workhorse for classification, summarization, or light coding tasks at scale.
Price
$0.02/1M
Context
131k tokens
Best for speed

DeepSeek V4-Flash

View
Why this recommendation

DeepSeek V4-Flash is the better pick when response speed matters more than maximum reasoning depth.

DeepSeekBudget
Best for
High-volume agentic coding and tool-use pipelines
Price
$0.14/1M
Context
1M tokens

Why this page recommends it

GPT-5.6 Luna leads on coding with a score of 88 vs 87 for DeepSeek V4-Flash.

GPT-5.6 Luna has the larger context window: 1.05M vs 1M for DeepSeek V4-Flash.

DeepSeek V4-Flash is cheaper at $0.14/1M input tokens vs $0.2/1M for GPT-5.6 Luna.

Decision notes

Choose GPT-5.6 Luna for coding and writing — cheap high-throughput summarization.

Choose DeepSeek V4-Flash when high-volume agentic coding and tool-use pipelines.

DeepSeek V4-Flash is the more cost-efficient option at $0.14/1M — worth considering if token volume is a concern.

Interactive decision lab

Test the recommendation against your priority

Switch the scoring lens to see whether the top answer changes when you care more about cost, speed, or long-document work.

#1GPT-5.6 Luna82 pts
#2DeepSeek V4-Flash79 pts
Quality first

GPT-5.6 Luna

OpenAI / Budget / Aug 6, 2026

82

Best budget model from a frontier lab — near-frontier scores at commodity price.

Ranks models by the broadest mix of coding, writing, research, and long-context usefulness.

Cost
$0.20/1M
$1.20/1M out
Speed
Fast
4/100 score
Context
1.1M tokens
input window
View model
Data-backed recommendation
Avoid this pick if

Your workload actually uses the long context window — recall drops to 41% past 512K tokens.

Recommended comparisons

The fastest way to see where the recommendation shifts when your priority changes.

OpenAIBudgetWinner: GPT-5.6 Luna

GPT-5.6 Luna

Best budget model from a frontier lab — near-frontier scores at commodity price.

Best use case
Cheap high-throughput summarization, drafting, and routine agent steps
Input
$0.20/1M
Pricing
Budget
Speed
Fast
Context
1.1M tokens
BudgetFastHigh volume
DeepSeekBudgetOption 2

DeepSeek V4-Flash

Best agentic capability per dollar in the directory.

Best use case
High-volume agentic coding and tool-use pipelines
Input
$0.14/1M
Pricing
Budget
Speed
Fast
Context
1M tokens
Open weightsBudgetAgentic

Pros

Punches far above its price: GPQA Diamond 92.3%, SWE-bench Pro 62.7%, Terminal-Bench 2.1 84.7%

$0.20/$1.20 per 1M after the July 30, 2026 price cut — dramatically cheaper per token than Gemini 3.6 Flash

Full 1.05M-token context at budget pricing — larger than most rival small models

Cons

Long-context recall collapses at scale: 41.3% on 512K–1M token tasks vs Terra's 72.5%

Text and image input only — no video, audio, or native PDF ingestion like Gemini 3.6 Flash

Explore related decisions

Comparison
GPT-5.6 Luna vs Gemini 3.5 Flash-LiteGPT-5.6 Luna vs Gemini 3.5 Flash-Lite — see exactly which wins on SWE-bench coding, price per 1M tokens, context window, and speed, with a clear verdict for…Read guide
Comparison
DeepSeek V4-Pro vs DeepSeek V4-FlashDeepSeek V4-Pro vs DeepSeek V4-Flash — see exactly which wins on SWE-bench coding, price per 1M tokens, context window, and speed, with a clear verdict for…Read guide
OpenAI
GPT-5.6 LunaBest budget model from a frontier lab — near-frontier scores at commodity price.Read guide
DeepSeek
DeepSeek V4-FlashBest agentic capability per dollar in the directory.Read guide
Alternatives
Best GPT-5.6 Luna AlternativesLooking for a GPT-5.6 Luna alternative? Compare 5 rivals on real capability scores, price per 1M tokens, and context size — including cheaper and open-weight…Read guide
Alternatives
Best DeepSeek V4-Flash AlternativesLooking for a DeepSeek V4-Flash alternative? Compare 5 rivals on real capability scores, price per 1M tokens, and context size — including cheaper and…Read guide
Guide
Best AI for CodingClaude Opus 4.7 leads coding AI in 2026 with 64.3% on SWE-Bench Pro. Compare it to GPT-5.5, Claude Sonnet 4.6, and budget picks like DeepSeek V3 for your stack.Read guide
Guide
Best AI for WritingClaude leads AI writing quality in 2026. Compare Claude Opus 4.7, Sonnet 4.6, GPT-4o, and budget picks for long-form content, brand voice, and professional…Read guide

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FAQ

Is GPT-5.6 Luna better than DeepSeek V4-Flash?

GPT-5.6 Luna wins on more categories — coding, writing, budget. DeepSeek V4-Flash is the better pick when high-volume agentic coding and tool-use pipelines. The right choice depends on your specific use case.

Which is cheaper — GPT-5.6 Luna or DeepSeek V4-Flash?

DeepSeek V4-Flash is cheaper at $0.14/1M input and $0.28/1M output. GPT-5.6 Luna costs $0.2/1M input and $1.2/1M output.

Which has a larger context window — GPT-5.6 Luna or DeepSeek V4-Flash?

GPT-5.6 Luna has the larger context window at 1.05M tokens vs DeepSeek V4-Flash's 1M. For large document analysis, GPT-5.6 Luna is the stronger pick.

Is GPT-5.6 Luna or DeepSeek V4-Flash better for coding?

GPT-5.6 Luna is better for coding with a score of 88 vs DeepSeek V4-Flash's 87 (out of 100). Claude Fable 5 is the overall coding leader in this directory at 100/100.

Which is faster — GPT-5.6 Luna or DeepSeek V4-Flash?

Both GPT-5.6 Luna and DeepSeek V4-Flash have similar speed profiles — rated fast.