LLMcompare

Search

Search for a command to run...

A · open · DeepSeek

DeepSeek V4 Pro

DeepSeek

B · closed · GPT-5.x

GPT-5.6 Terra

OpenAI

2:11

overall capability wins (0 ties across 13 scored). GPT-5.6 Terra leads overall.

  • Reasoning1:5
  • Coding0:3
  • Arena0:1
  • Tool use0:1
  • Composite indices0:2
  • Pricing3:0
  • Speed0:2
  • Specs1:1

Verdict

GPT-5.6 Terra leads coding (widest gap: +75.5 on WebDev Elo); GPT-5.6 Terra ranks higher on LMArena (+9 Elo); GPT-5.6 Terra offers larger context (1.1M vs 1M).

  • GPT-5.6 Terra leads coding (widest gap: +75.5 on WebDev Elo)
  • GPT-5.6 Terra ranks higher on LMArena (+9 Elo)
  • GPT-5.6 Terra offers larger context (1.1M vs 1M)
  • DeepSeek V4 Pro allows ~3.0x more max output (384K vs 128K)
  • DeepSeek V4 Pro ships open weights (MIT)
  • DeepSeek V4 Pro is ~8.3x cheaper on a blended token basis than GPT-5.6 Terra

Cost for 1M in + 250K out

Illustrative chat workload at primary-provider list prices.

DeepSeek V4 Pro
$0.65
GPT-5.6 Terra
$5

DeepSeek V4 Pro is about 7.7x cheaper on this workload.

Price per 1M tokens

Full comparison

Organization

DeepSeek

OpenAI

Family

DeepSeek

GPT-5.x

License

MIT

Proprietary

Open weights

Yes

No

Release

Apr 24, 2026

Jul 9, 2026

Knowledge cutoff

-

-

API / provider

DeepSeek

OpenAI

Modalities

text → text

text, image → text

Specs

Context window

1M

1.1M

B +50K

Max output

384K

128K

A +256K

Parameters

1.6T (49B act.)

—

—

Pricing

Input $/1M

$0.43

$2

A +$1.56

Output $/1M

$0.87

$12

A +$11.13

Blended $/1M (3∶1)

$0.54

$4.50

A +$3.96

Speed

tok/s

85

135

B +50

TTFT (s)

0.4

0.3

B +0.10

Reasoning

MMLU-Pro

—

—

—

GPQA Diamond

88.8

92.5

B +3.7 pts

Humanity's Last Exam

37.5

42.9

B +5.4 pts

AIME 2025

—

—

—

MATH-500

—

—

—

Humanity's Last Exam (with tools)

—

—

—

AA-Omniscience Accuracy

43.0

46.8

B +3.8 pts

AA-LCR v1.1

74.7

83.0

B +8.3 pts

CritPt

12.9

30.0

B +17.1 pts

MMMU-Pro

—

80.7

—

IFBench

76.5

71.2

A +5.3 pts

Chartography

—

—

—

Chartography (With Tools)

—

—

—

Coding

SWE-bench Verified

—

—

—

SWE-bench Pro

—

63.4

—

SWE-bench Multilingual

—

—

—

LiveCodeBench

—

—

—

Terminal-Bench 2.1

64.0

88.0

B +24.0 pts

Aider Polyglot

—

—

—

Terminal-Bench 3

—

20.8

—

BigCodeBench

—

—

—

SciCode

50.8

55.0

B +4.2 pts

CursorBench

—

64.9

—

SWE-Rebench

41.4

—

—

NL2Repo-Bench

38.5

—

—

DeepSWE

12.8

—

—

WebDev Arena

1,446

1,521

B +76 Elo

Terminal-Bench 4.0

—

21.5

—

CursorBench 4.0

—

—

—

FrontierCode v1.1 (Main)

—

—

—

Arena

LMArena Elo

1,457

1,466

B +9 Elo

DeepSeek V4 Pro

Context
1M / 384K out
Parameters
1.6T (49B act.)
Price
$0.43 / $0.87
Speed
85 tok/s · 0.4s TTFT
Modalities
text → text
License
MIT

Open-weight frontier MoE - exceptional quality-per-dollar with MIT license and 1M context. Scores shown are the original preview; the GA 0813 release improves agentic coding substantially.

GPT-5.6 Terra

Context
1.1M / 128K out
Parameters
—
Price
$2 / $12
Speed
135 tok/s · 0.3s TTFT
Modalities
text, image → text
License
Proprietary

Balanced GPT-5.6 mid-tier for everyday work; July 30, 2026 API cut brought Standard rates to $2/$12 (20% lower), with strong throughput for the price.

Benchmark charts

Winner bars are emphasized. Per-benchmark deltas sit above each chart.

Reasoning & knowledge

GPQA: B +3.7HLE: B +5.4CritPt: B +17.1AA-LCR: B +8.3Omniscience Acc.: B +3.8IFBench: A +5.3

Coding

TermBench: B +24.0SciCode: B +4.2WebDev Elo: B +76

Tool use & function calling

τ³-Banking: B +10.1

Arena

Arena Elo: B +9

Composite indices

AA Index: B +15.9AA Index v4.3: B +11.4

Pick a different pair · Back to catalog