Head-to-head comparison

GPT-5.6 Sol vs. DeepSeek-V4.1-Flash

Compare published benchmark results from matching versions and cohorts, API pricing, and technical specifications. Any documented test setup differences remain visible.

shared result series: 0
distinct benchmarks: 0
latest retrieval: No data

First modelSecond model

Specifications

General specifications

Release date, availability, context window, architecture, and published parameter counts at a glance. Undisclosed details remain marked as unavailable.

Specifications for GPT-5.6 Sol and DeepSeek-V4.1-Flash
Attribute	GPT-5.6 Sol	DeepSeek-V4.1-Flash
Provider	OpenAI	DeepSeek
Released	Jul 9, 2026	Sep 10, 2026
Availability	Active	Active
Model type	Proprietary	Open Weights
Parameters	Not published	552B
Architecture	Not published	Mixture of Experts
Context window	1,050,000 tokens	1,000,000 tokens
Knowledge cutoff	February 16, 2026	Not published
Technical sources	Model, Context, Knowledge cutoff	Model

Pricing

API pricing compared

The table compares official standard API rates per 1M tokens, including published cache pricing. Batch, fast, priority, regional surcharges, tool calls, and cloud platform pricing are excluded.

API pricing for GPT-5.6 Sol and DeepSeek-V4.1-Flash
Price type	GPT-5.6 Sol	DeepSeek-V4.1-Flash
API input	$4 ≤272K / $8 >272K	$0.15
API output	$20 ≤272K / $30 >272K	$0.6
Cache read	$0.4 ≤272K / $0.8 >272K	$0.
Cache write (5 min.)	$5 ≤272K / $10 >272K	Not listed
Cache write (1 hr.)	Not listed	Not listed
Price verified	08/24/2026 Source	09/22/2026 Source

GPT-5.6 SolDeepSeek-V4.1-Flash

API inputUSD per 1M tokens, base tier

GPT-5.6 Sol$4

DeepSeek-V4.1-Flash$0.15

API outputUSD per 1M tokens, base tier

GPT-5.6 Sol$20

DeepSeek-V4.1-Flash$0.6

Cache readUSD per 1M tokens, base tier

GPT-5.6 Sol$0.4

DeepSeek-V4.1-Flash$0.003

Key to the marks:better valuebetter, but not conclusivetie

Pricing by provider

Direct developer pricing and provider endpoint tariffs routed through OpenRouter are listed separately. Prices are in USD per 1M tokens. Context-dependent direct tiers plus regional, Flex, Priority, and other OpenRouter tariffs remain individually identifiable.

Provider pricing for GPT-5.6 Sol and DeepSeek-V4.1-Flash
Model	Provider	Purchase route and tariff	Input per 1M tokens	Output per 1M tokens	Source
GPT-5.6 Sol	OpenAI	Direct from developerUp to 272,000 context tokens	$4	$20	Source08/24/2026
	OpenAI	Direct from developerAbove 272,000 context tokens	$8	$30	Source08/24/2026
	Amazon Bedrock	Via OpenRouteramazon-bedrock/us-east-1	$4.4	$22	Source09/22/2026
	Azure	Via OpenRouterazure	$5	$30	Source09/22/2026
	Azure	Via OpenRouterazure/eu	$5.5	$33	Source09/22/2026
	Azure	Via OpenRouterazure/us	$5.5	$33	Source09/22/2026
	OpenAI	Via OpenRouteropenai	$2	$10	Source09/22/2026
	OpenAI	Via OpenRouteropenai/fast	$4	$20	Source09/22/2026
	OpenAI	Via OpenRouteropenai/flex	Lowest listed price: $1	Lowest listed price: $5	Source09/22/2026
DeepSeek-V4.1-Flash	DeepSeek	Direct from developerStandard API	$0.15	$0.6	Source09/22/2026
	Alibaba	Via OpenRouteralibaba	$0.3	$1.2	Source09/22/2026
	AtlasCloud	Via OpenRouteratlas-cloud/fp8	$0.3	$1.2	Source09/22/2026
	BaseTen	Via OpenRouterbaseten/fp8#1	$0.3	$1.2	Source09/22/2026
	BaseTen	Via OpenRouterbaseten/fp8#2	$0.3	$1.2	Source09/22/2026
	CoreWeave	Via OpenRoutercoreweave/fp8	$0.2	$0.65	Source09/22/2026
	DeepInfra	Via OpenRouterdeepinfra/fp8	$0.14	Lowest listed price: $0.42	Source09/22/2026
	DeepSeek	Via OpenRouterdeepseek	$0.15	$0.6	Source09/22/2026
	DigitalOcean	Via OpenRouterdigitalocean	$0.3	$1.2	Source09/22/2026
	Fireworks	Via OpenRouterfireworks	$0.22	$0.66	Source09/22/2026
	GMICloud	Via OpenRoutergmicloud/fp8	$0.285	$1.14	Source09/22/2026
	Krea	Via OpenRouterkrea/fp8	$0.225	$0.9	Source09/22/2026
	Makora	Via OpenRoutermakora	$0.3	$1.2	Source09/22/2026
	Modal	Via OpenRoutermodal	$0.3	$1.2	Source09/22/2026
	Morph	Via OpenRoutermorph	Lowest listed price: $0.12	$0.48	Source09/22/2026
	Novita	Via OpenRouternovita/fp8	$0.285	$1.14	Source09/22/2026
	Phala	Via OpenRouterphala	$0.276	$1.104	Source09/22/2026
	Relace	Via OpenRouterrelace/fp4	$0.13	$0.52	Source09/22/2026
	Sail Research	Via OpenRoutersail-research/fp4	$0.2	$0.6	Source09/22/2026
	SiliconFlow	Via OpenRoutersiliconflow/fp8	$0.3	$1.2	Source09/22/2026
	StreamLake	Via OpenRouterstreamlake/fp8	$0.2197	$0.8788	Source09/22/2026
	Together	Via OpenRoutertogether	$0.3	$1.2	Source09/22/2026
	Venice	Via OpenRoutervenice/fp8	$0.375	$1.5	Source09/22/2026
	Wafer	Via OpenRouterwafer	$0.2	$0.6	Source09/22/2026

Performance

Shared benchmarks

Only published results with the same benchmark version, task, metric, and comparison cohort are paired. Different reasoning levels, agents, harnesses, or output limits appear directly in the table.

Capability profile from matched benchmarks

Each axis averages directly matched benchmark families. A value of 100 means the stronger value within this pair, not a universal quality score.

Not enough directly matched categories for a reliable radar

Only 0 of at least 5 categories have comparable, direct model measurements. The benchmark tables below show the available evidence without filling missing axes.

No directly comparable result series yet

No published benchmark for GPT-5.6 Sol and DeepSeek-V4.1-Flash currently matches in version, task, metric, and comparison cohort. We therefore show no estimated or blended values.

Our model tests

Our tests

Compare how the models respond to the same prompt. Each test shows the first attempt, with no subsequent fixes to the generated code. These results do not contribute to an overall score.

Pelican on a bicycle

A community classic for free-form SVG drawing.

GPT-5.6 Sol

API access was unavailable for this run. The model was not evaluated.

Reasoning (requested): high

First attempt

Run date: 7 Sept 2026
API provider: openrouter
Requested API model: openai/gpt-5.6-sol
Reasoning setting: high
Pinned endpoint: OpenAI | openai/gpt-5.6-sol-20260709
Temperature: Provider default
Token limit including reasoning: 8,192 tokens
Test protocol: community-visual-tests-v1
Technical checks: Not run

Not yet visually reviewed. A successful recording does not confirm correct physics or full compliance with the prompt.

DeepSeek-V4.1-Flash

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)

How to read this comparison

Winning one benchmark is not an overall verdict

Your workload, budget, and required context length matter most. A coding benchmark says little about visual understanding or agent performance.

The standard price table uses direct developer rates. The provider comparison labels OpenRouter endpoints, regions, and special tariffs separately.

Every result links to its measurement source and retrieval date. Labels distinguish vendor reports, official benchmark leaderboards, and independent evaluations. Disputed or archived results are excluded.

More matchups

Compare GPT-5.6 Sol and DeepSeek-V4.1-Flash with other leading models using the same data and benchmark logic.

View the complete LLM comparison