Which is more cost-effective, DeepSeek V4 Pro or GPT-6.1 Sol?

Based on 1M input + 1M output tokens, DeepSeek V4 Pro costs $5.28/month versus GPT-6.1 Sol at $12.00/month. The cheaper option depends on your token volume and prompt-to-completion ratio. Use the interactive calculator on this page to enter your exact usage.

How accurate is this cost comparison?

List prices come from each provider's own pricing page and every model page shows when they were last verified. The capability scores are iOPTERA's editorial composites — informed by public benchmarks, not benchmark results themselves; the methodology page explains how they are set.

Which model scores higher on benchmarks?

DeepSeek V4 Pro scores 94 in coding and 96 in reasoning benchmarks. GPT-6.1 Sol scores 96 in coding and 97 in reasoning. See the full 5-category breakdown in the Benchmark Comparison section above.

What are the context window sizes of DeepSeek V4 Pro and GPT-6.1 Sol?

DeepSeek V4 Pro supports a 1.0M-token context window while GPT-6.1 Sol supports 1.1M tokens. A larger context window lets you process more text in a single API call.

Which model is faster for real-time applications?

DeepSeek V4 Pro has a speed score of 70/100 and GPT-6.1 Sol scores 85/100 on our latency benchmark. For interactive chatbots and low-latency tasks, the higher speed score is preferable.

Can I calculate costs for my specific token volume?

Yes. Use the interactive cost calculator on this page. Enter your monthly token volume and adjust the prompt-to-completion ratio. You can also use presets for common scenarios like Customer Support Bots (~30M tokens/month) or Document Summarizers (~15M tokens/month).

Cost and performance comparison

DeepSeek V4 Pro vs GPT-6.1 Sol

Model ADeepSeek

DeepSeek V4 Pro

Capability score (editorial)96/100

Cost / 1M Tokens: $2.11; 70% in · 30% out mix
Value Index (score÷cost): 44.6; Higher = better value

Speed: 70/100
Context: 1.0M
Tier: Power Tier

List price from the DeepSeek pricing page, verified October 12, 2026.

Across the 25 languages we measured, it needs about 21% more tokens than OpenAI's for the same text. Costs by language

Check the source

How we verify prices

Model BOpenAI

GPT-6.1 Sol

Capability score (editorial)97/100

Cost / 1M Tokens: $4.40; 70% in · 30% out mix
Value Index (score÷cost): 22.0; Higher = better value

Speed: 85/100
Context: 1.1M
Tier: Smart Tier

List price from the OpenAI pricing page, verified October 12, 2026.

Check the source

How we verify prices

In-depth analysis

DeepSeek V4 Pro vs GPT-6.1 Sol: Detailed Comparison

DeepSeek V4 Pro is DeepSeek's flagship-tier language model with a 1.0M-token context window, excelling at reasoning. GPT-6.1 Sol from OpenAI is a mid-range-tier model supporting 1.1M tokens in context, with standout performance in reasoning.

GPT-6.1 Sol costs 2.0x what DeepSeek V4 Pro does for the same text. That is a steep premium, and it buys a 3-point lead on combined coding and reasoning. Whether that trade is worth it depends entirely on how much of your traffic actually needs the harder model — for most workloads the honest answer is a small fraction of it, which is an argument for routing rather than for picking one. DeepSeek V4 Pro is priced at $1.32/M input tokens and $3.96/M output tokens. GPT-6.1 Sol costs $2.00/M input and $10.00/M output.

On iOPTERA's editorial scores, GPT-6.1 Sol leads with 96/100 for coding and 97/100 for reasoning, against DeepSeek V4 Pro's 94/100 and 96/100.

Capability breakdown

Across the five core benchmark categories, here is how DeepSeek V4 Pro and GPT-6.1 Sol stack up head to head:

coding

GPT-6.1 Sol leads

reasoning

GPT-6.1 Sol leads

data extraction

GPT-6.1 Sol leads

creative tasks

GPT-6.1 Sol leads

vision/multimodal

GPT-6.1 Sol leads

Best model by task

coding: GPT-6.1 Sol wins with 96/100
reasoning: GPT-6.1 Sol wins with 97/100
data extraction: GPT-6.1 Sol wins with 95/100
creative tasks: GPT-6.1 Sol wins with 94/100
vision/multimodal: GPT-6.1 Sol wins with 95/100

Estimated monthly cost at scale

For 10M + 2M tokens of text a month (counted the way OpenAI's tokenizer counts), DeepSeek V4 Pro runs about $21.54 while GPT-6.1 Sol runs about $40.00 — DeepSeek V4 Pro saves roughly $18.46 (46%) every month.

What actually decides it

DeepSeek V4 Pro and GPT-6.1 Sol come from different labs, which means different tokenizers, different API shapes, and a second vendor relationship. The same English text does not produce the same token count on both, so a price-per-million comparison understates the difference — measure your own prompts on each before treating the headline rates as the full story.

GPT-6.1 Sol and DeepSeek V4 Pro were released within 5 months of each other, so they are competing on the same evaluations under roughly the same conditions. That makes a direct benchmark comparison meaningful here in a way it usually is not — neither model has the advantage of being measured on a newer, easier set of tests.

Context is effectively a tie: 1.1M against 1.0M. Neither model unlocks a document size the other cannot handle, so this axis should not enter the decision. If you were hoping context would break the tie for you, it will not.

Latency separates them: GPT-6.1 Sol scores 85/100 against 70/100 for DeepSeek V4 Pro, a 15-point gap. That matters for anything a person waits on — chat, autocomplete, interactive tools. For batch and background work it does not, and trading latency for capability there is usually the right call.

One practical asymmetry: GPT-6.1 Sol offers a batch API at 50% off standard rates, and DeepSeek V4 Pro does not. For anything that does not need an answer immediately — nightly enrichment, backfills, evaluation runs — that discount can be worth more than the difference in list price, and it is easy to overlook when comparing headline rates.

GPT-6.1 Sol is 2.0x the price of DeepSeek V4 Pro. Reserve it for the requests that actually need it and route the rest to DeepSeek V4 Pro — that hybrid beats either model used alone on cost per useful answer.

What you actually pay

The list price is only the start. Prompt caching, batch processing and long prompts change the bill, and each provider sets them differently. Prices per 1M tokens.

Pricing terms beyond the list price, per 1M tokens
Pricing term	DeepSeek V4 Pro	GPT-6.1 Sol
List price (input / output)	$1.32 / $3.96	$2.00 / $10.00
Cached input	$0.0443.3% of the input price	$0.105% of the input price
Batch API	Not on the price page	50% off input and output
Long prompts	No surcharge across the 1M window	Over 272K tokens: $4.00 / $15.00
Off-peak	50% off outside 01:00–04:00, 06:00–10:00 UTC on weekdays	Not on the price page
Input with 80% cache hits	$0.299	$0.48

With 80% of input served from the cache, DeepSeek V4 Pro costs 36% less than GPT-6.1 Sol for the same input text, counting each model's tokenizer.

The last row assumes 80% of input tokens are read from the cache, as in a chat app that re-sends a long system prompt or RAG over the same documents. Cache-write and storage charges are not included.

Checked on October 8, 2026 against the pricing pages of DeepSeek, OpenAI.

Capability scores

iOPTERA editorial scores across 5 categories — informed by public benchmarks, not measured by us

CategoryDeepSeek V4GPT-6.1 SolWinner

Coding

Reasoning

Extraction

Creative

Vision

DeepSeek V4 Pro: 0 wins

GPT-6.1 Sol: 5 wins

GPT-6.1 Sol leads overall

Speed Score

70/100vs85/100

DeepSeekGPT-6.1

Context Window

1000Kvs1050K

DeepSeekGPT-6.1

What Is a Token?

Models don't read words — they process tokens.

A token is roughly 4 characters of English text (~¾ of a word). Your API bill is priced per million tokens — understanding this directly reduces your costs.

Short phrase

"Hello, world!"

4 tokens

DeepSeek V4 Pro: $0.54
GPT-6.1 Sol: $0.80

Business email

One typical email (~200 words)

~270 tokens

DeepSeek V4 Pro: $36.35
GPT-6.1 Sol: $54.00

Code file

50-line Python script

~400 tokens

DeepSeek V4 Pro: $53.86
GPT-6.1 Sol: $80.00

Prices shown are for 100,000 runs of each workload — one run costs a fraction of a cent on both DeepSeek V4 Pro and GPT-6.1 Sol, so the number only becomes meaningful at production volume. Input tokens only; add your output volume in the calculator below.

How to check your token usage

response.usage.total_tokens

Every API response includes a usage object. Sum total_tokens across all calls to get your monthly figure, then use the calculator below.

Your Cost Calculator

Enter your actual monthly token usage to see real savings

Quick Presets

Monthly Token Volume

30M tokens

Prompt / Completion Split

Prompt 70%Completion 30%

Cheaper

DeepSeek V4 Pro

$64.63/mo

$775.53/yr

$1.32/M input$3.96/M output

GPT-6.1 Sol

$132.00/mo

$1,584.00/yr

$2.00/M input$10.00/M output

Annual Savings

$808.47 saved per year

DeepSeek V4 Pro cheaper · $67.37/mo

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