Pairwise benchmark snapshot · Aug 16, 2026

DeepSeek V4 Pro vs GPT-5.6 Terra benchmark

Name: DeepSeek V4 Pro vs GPT-5.6 Terra AI benchmark comparison
Creator: CompareLLM
License: https://creativecommons.org/licenses/by/4.0/

This page compares DeepSeek V4 Pro (DeepSeek) and GPT-5.6 Terra (OpenAI) using the latest snapshots we have as of Aug 16, 2026. On preference Elo, GPT-5.6 Terra is ahead by 12 points (1,548 vs 1,536; seed-bootstrap (Aug 16, 2026)). On SWE-bench coding, DeepSeek V4 Pro resolves 71.6% versus 70.4% (seed-bootstrap (Aug 1, 2026)). GPT-5.6 Terra streams faster (128 tok/s) while DeepSeek V4 Pro is the cheaper output token ($0.87/1M). GPT-5.6 Terra has the larger context window (1.1M tokens). Every cell below is a dated snapshot from a named public source — we do not invent missing scores, and we do not run SWE-bench ourselves.

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DeepSeek

DeepSeek V4 Pro

Open-weight-adjacent DeepSeek flagship. High reasoning density per dollar.

Elo 1,536$0.87/1M out

OpenAI

GPT-5.6 Terra

OpenAI 5.6 mid tier. Official API $2/$12 per 1M after the Jul 30 2026 price cut.

Elo 1,548$6/1M out

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Model A

Model B

Quick vs:vs Claude Opus 4.5 vs Claude Opus 4.6 vs Claude Sonnet 4.5 vs Claude 3.7 Sonnet

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

DeepSeek V4 Pro (6)vsGPT-5.6 Terra (4)

DeepSeek V4 Pro: 6W (60%)Overall: DeepSeek V4 ProGPT-5.6 Terra: 4W (40%)

← DeepSeek V4 ProGPT-5.6 Terra →

DeepSeek V4 Pro (4/5)

Intelligence & Reasoning

Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy

Preference Elo

1,536vs1,548

Coding Elo

1,544vs1,542

SWE-bench

71.6%vs70.4%

LiveBench

70.1%vs69.1%

GPQA Diamond

84%vs82%

DeepSeek V4 Pro: 4WGPT-5.6 Terra: 1W

GPT-5.6 Terra (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

70 tok/svs128 tok/s

Time to first token

410 msvs160 ms

DeepSeek V4 Pro: 0WGPT-5.6 Terra: 2W

DeepSeek V4 Pro (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$0.87/1Mvs$6/1M

Input price

$0.44/1Mvs$1/1M

Context window

1Mvs1.1M

DeepSeek V4 Pro: 2WGPT-5.6 Terra: 1W

Capability Matchup Radar

Multi-Dimensional Capability Radar

Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.

Tap any node to inspect

Percentile 0–100

Dimensional AdvantageDeepSeek V4 Pro 4/6

Preference Elo

GPT-5.6 Terra

12 pts advantage

Throughput Speed

GPT-5.6 Terra

58 tok/s faster

Price Efficiency

DeepSeek V4 Pro

$5.13/1M cheaper

Full Benchmark Score Matrix

—

Elo

High is better

1,536

EloHigh is better

1,548+1%

Code Elo

High is better

1,544

Code EloHigh is better

1,542

LiveBench

High is better

+1%70.1%

LiveBenchHigh is better

69.1%

SWE-bench

High is better

+2%71.6%

SWE-benchHigh is better

70.4%

GPQA

High is better

+2%84%

GPQAHigh is better

82%

TTFT

Low is better

410 ms

TTFTLow is better

160 ms+156%

Speed

High is better

70 tok/s

SpeedHigh is better

128 tok/s+83%

In $

Low is better

+130%$0.44/1M

In $Low is better

$1/1M

Out $

Low is better

+590%$0.87/1M

Out $Low is better

$6/1M

Context

High is better

ContextHigh is better

1.1M

Interactive Simulator

Workload Cost & Savings Calculator

Simulate monthly production API costs based on published $/1M tokens.

Save up to 77% with DeepSeek V4 Pro

Monthly Volume50M tokens/mo

Quick Presets:

Token Ratio (In vs Out)70% In / 30% Out

RAG / Search (10% out)Coding / Chat (50% out)

DeepSeek V4 Pro$28.28 / mo

In: $15.22Out: $13.05

GPT-5.6 Terra$125.00 / mo

In: $35.00Out: $90.00

Estimated Cost Delta

DeepSeek V4 Pro is estimated to save $96.73/month ($1,161/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

1
DeepSeek V4 Pro:Pick DeepSeek V4 Pro when repo-level coding accuracy is the constraint.
2
GPT-5.6 Terra:Pick GPT-5.6 Terra when time-to-first-token matters more than peak Elo.
3
GPT-5.6 Terra:Pick GPT-5.6 Terra for million-token RAG or long-document jobs.

Recommended Workload Routing

Repo / coding agentsDeepSeek V4 Pro

Higher SWE-bench (71.6%).

High-volume chatDeepSeek V4 Pro

Lower output list price ($0.87/1M).

Voice / low-latency UIGPT-5.6 Terra

Lower TTFT (160 ms).

Long-document RAGGPT-5.6 Terra

Larger window (1.1M).

Screenshots / visionGPT-5.6 Terra

GPT-5.6 Terra is the side marked multimodal in the catalog.

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	DeepSeek V4 Pro	Higher SWE-bench (71.6%).
High-volume chat	DeepSeek V4 Pro	Lower output list price ($0.87/1M).
Voice / low-latency UI	GPT-5.6 Terra	Lower TTFT (160 ms).
Long-document RAG	GPT-5.6 Terra	Larger window (1.1M).
Screenshots / vision	GPT-5.6 Terra	GPT-5.6 Terra is the side marked multimodal in the catalog.

Related Editorial Dispatches & Benchmark Notes

View all news

priceJul 30, 2026

GPT-5.6 Terra after the Jul 30 cut: $2/$12 mid-tier

Terra is OpenAI’s Sonnet-class invoice. Use it when Sol is too expensive and Luna is too small.

compareJun 13, 2026

DeepSeek vs Claude: the cheap-versus-frontier question, remapped

Top DeepSeek vs top Anthropic Elo. Usually V4 Pro vs Opus 5. License and invoice decide as much as Elo.

launchJun 12, 2026

DeepSeek V4 Pro: high reasoning density per dollar

2026-06 open-weight-adjacent flagship. The usual cheap-vs-Claude question starts here.

launchJan 20, 2025

DeepSeek R1 stays as the open-weights RL baseline

Jan 2025 reasoning model. Still searched. V4 Pro is the newer DeepSeek buy.

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LIVE

DeepSeek

DeepSeek V4 Pro

Elo 1,536

LiveBench70.1%

SWE-bench71.6%

Speed70 tok/s

Output cost$0.87/1M

OpenAI

GPT-5.6 Terra

Elo 1,548

LiveBench69.1%

SWE-bench70.4%

Speed128 tok/s

Output cost$6/1M

Frequently Asked Questions

Which is better overall, DeepSeek V4 Pro or GPT-5.6 Terra?: GPT-5.6 Terra has the higher preference Elo in our latest snapshot (1,548). “Better” still depends on coding, price, and latency — see the table.
Which is better at coding, DeepSeek V4 Pro or GPT-5.6 Terra?: DeepSeek V4 Pro leads SWE-bench at 71.6% vs 70.4%. SWE-bench is one harness, not your repo.
Which is cheaper to run in production?: DeepSeek V4 Pro output tokens are $0.87/1M versus $6/1M. Input prices and retry rates still move the real bill.
Which is faster, DeepSeek V4 Pro or GPT-5.6 Terra?: GPT-5.6 Terra has the lower time-to-first-token (160 ms vs 410 ms). Tokens/sec is a separate column if you care about long completions.
Which has the larger context window?: GPT-5.6 Terra accepts 1.1M tokens versus 1M.
Can I self-host either model?: DeepSeek V4 Pro is marked open-weights in our catalog. The other side is a closed API. Check the provider license before you ship weights.
Are these scores from CompareLLM’s own evals?: No. V1 aggregates public leaderboards (and optional first-party latency pings). Each cell names its source and date. Read /methodology.
What does preference Elo mean on this page?: Preference Elo is a crowd vote from LMArena / Arena. People see two hidden answers and pick the one they like more. The model that wins more often gets a higher Elo. That means people preferred it — not that it passed a school test. It is not SWE-bench, not accuracy, and not a number we invent. DeepSeek V4 Pro and GPT-5.6 Terra Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Similar Head-to-Head Comparisons

All DeepSeek V4 Pro matchups →|All GPT-5.6 Terra matchups →

DeepSeek V4 Pro vs DeepSeek R1 (previous deepseek)DeepSeek V4 Pro vs DeepSeek V4 Flash (next deepseek)GPT-4.5 Orion vs DeepSeek V4 Pro GPT-5 vs GPT-5.6 Terra GPT-5.6 Sol vs GPT-5.6 Terra OpenAI: o3 Mini vs GPT-5.6 Terra

DeepSeek V4 Pro vs GPT-5.6 Terra benchmark

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

DeepSeek V4 Pro (6)vsGPT-5.6 Terra (4)

DeepSeek V4 Pro: 6W (60%)Overall: DeepSeek V4 ProGPT-5.6 Terra: 4W (40%)

← DeepSeek V4 ProGPT-5.6 Terra →

DeepSeek V4 Pro (4/5)

Intelligence & Reasoning

Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy

Preference Elo

1,536vs1,548

Coding Elo

1,544vs1,542

SWE-bench

71.6%vs70.4%

LiveBench

70.1%vs69.1%

GPQA Diamond

84%vs82%

DeepSeek V4 Pro: 4WGPT-5.6 Terra: 1W

GPT-5.6 Terra (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

70 tok/svs128 tok/s

Time to first token

410 msvs160 ms

DeepSeek V4 Pro: 0WGPT-5.6 Terra: 2W

DeepSeek V4 Pro (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$0.87/1Mvs$6/1M

Input price

$0.44/1Mvs$1/1M

Context window

1Mvs1.1M

DeepSeek V4 Pro: 2WGPT-5.6 Terra: 1W

Recommended Workload Routing

Repo / coding agentsDeepSeek V4 Pro

Higher SWE-bench (71.6%).

High-volume chatDeepSeek V4 Pro

Lower output list price ($0.87/1M).

Voice / low-latency UIGPT-5.6 Terra

Lower TTFT (160 ms).

Long-document RAGGPT-5.6 Terra

Larger window (1.1M).

Screenshots / visionGPT-5.6 Terra

GPT-5.6 Terra is the side marked multimodal in the catalog.

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	DeepSeek V4 Pro	Higher SWE-bench (71.6%).
High-volume chat	DeepSeek V4 Pro	Lower output list price ($0.87/1M).
Voice / low-latency UI	GPT-5.6 Terra	Lower TTFT (160 ms).
Long-document RAG	GPT-5.6 Terra	Larger window (1.1M).
Screenshots / vision	GPT-5.6 Terra	GPT-5.6 Terra is the side marked multimodal in the catalog.

Frequently Asked Questions

Which is better overall, DeepSeek V4 Pro or GPT-5.6 Terra?

GPT-5.6 Terra has the higher preference Elo in our latest snapshot (1,548). “Better” still depends on coding, price, and latency — see the table.

Which is better at coding, DeepSeek V4 Pro or GPT-5.6 Terra?

DeepSeek V4 Pro leads SWE-bench at 71.6% vs 70.4%. SWE-bench is one harness, not your repo.

Which is cheaper to run in production?

DeepSeek V4 Pro output tokens are $0.87/1M versus $6/1M. Input prices and retry rates still move the real bill.

Which is faster, DeepSeek V4 Pro or GPT-5.6 Terra?

GPT-5.6 Terra has the lower time-to-first-token (160 ms vs 410 ms). Tokens/sec is a separate column if you care about long completions.

Which has the larger context window?

GPT-5.6 Terra accepts 1.1M tokens versus 1M.

Can I self-host either model?

DeepSeek V4 Pro is marked open-weights in our catalog. The other side is a closed API. Check the provider license before you ship weights.

Are these scores from CompareLLM’s own evals?

No. V1 aggregates public leaderboards (and optional first-party latency pings). Each cell names its source and date. Read /methodology.

What does preference Elo mean on this page?

Preference Elo is a crowd vote from LMArena / Arena. People see two hidden answers and pick the one they like more. The model that wins more often gets a higher Elo. That means people preferred it — not that it passed a school test. It is not SWE-bench, not accuracy, and not a number we invent. DeepSeek V4 Pro and GPT-5.6 Terra Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Swap or Add Any Model to this Matchup

Interactive Comparison Diagram

Tug-of-War Matchup Matrix

Intelligence & Reasoning

Speed & Latency

Pricing & Capacity

Multi-Dimensional Capability Radar

GPT-5.6 Terra

GPT-5.6 Terra

DeepSeek V4 Pro

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

GPT-5.6 Terra after the Jul 30 cut: $2/$12 mid-tier

DeepSeek vs Claude: the cheap-versus-frontier question, remapped

DeepSeek V4 Pro: high reasoning density per dollar

DeepSeek R1 stays as the open-weights RL baseline

Cast Your Matchup Vote

Community Discussions (0)

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CompareLLM Matrix

DeepSeek V4 Pro

GPT-5.6 Terra

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons

Swap or Add Any Model to this Matchup

Interactive Comparison Diagram

Tug-of-War Matchup Matrix

Intelligence & Reasoning

Speed & Latency

Pricing & Capacity

Multi-Dimensional Capability Radar

GPT-5.6 Terra

GPT-5.6 Terra

DeepSeek V4 Pro

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

GPT-5.6 Terra after the Jul 30 cut: $2/$12 mid-tier

DeepSeek vs Claude: the cheap-versus-frontier question, remapped

DeepSeek V4 Pro: high reasoning density per dollar

DeepSeek R1 stays as the open-weights RL baseline

Cast Your Matchup Vote

Community Discussions (0)

Share card

CompareLLM Matrix

DeepSeek V4 Pro

GPT-5.6 Terra

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons