Pairwise benchmark snapshot · Aug 16, 2026

GPT-5.6 Terra vs Grok 4.6 benchmark

Name: GPT-5.6 Terra vs Grok 4.6 AI benchmark comparison
Creator: CompareLLM
License: https://creativecommons.org/licenses/by/4.0/

This page compares GPT-5.6 Terra (OpenAI) and Grok 4.6 (xAI) using the latest snapshots we have as of Aug 16, 2026. On preference Elo, Grok 4.6 is ahead by 44 points (1,592 vs 1,548; seed-bootstrap (Aug 16, 2026)). On SWE-bench coding, GPT-5.6 Terra resolves 70.4% versus 69.1% (seed-bootstrap (Aug 16, 2026)). GPT-5.6 Terra streams faster (128 tok/s) while GPT-5.6 Terra is the cheaper output token ($6/1M). 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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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

xAI

Grok 4.6

xAI Aug 12 2026 post-training refresh of Grok 4.5. Same $2/$6 API price, 500k context, stronger agentic traces.

Elo 1,592$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.

GPT-5.6 Terra (5)vsGrok 4.6 (4)

GPT-5.6 Terra: 5W (56%)Overall: GPT-5.6 TerraGrok 4.6: 4W (44%)

← GPT-5.6 Terra1 tiesGrok 4.6 →

Grok 4.6 (4/5)

Intelligence & Reasoning

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

Preference Elo

1,548vs1,592

Coding Elo

1,542vs1,568

SWE-bench

70.4%vs69.1%

LiveBench

69.1%vs71.4%

GPQA Diamond

82%vs84.6%

GPT-5.6 Terra: 1WGrok 4.6: 4W

GPT-5.6 Terra (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

128 tok/svs118 tok/s

Time to first token

160 msvs195 ms

GPT-5.6 Terra: 2WGrok 4.6: 0W

GPT-5.6 Terra (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$6/1Mvs$6/1M

Input price

$1/1Mvs$2/1M

Context window

1.1Mvs500k

GPT-5.6 Terra: 2WGrok 4.6: 0W

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 AdvantageGrok 4.6 3/6

Preference Elo

Grok 4.6

44 pts advantage

Throughput Speed

GPT-5.6 Terra

10 tok/s faster

Price Efficiency

GPT-5.6 Terra

Same token price

Full Benchmark Score Matrix

—

Elo

High is better

1,548

EloHigh is better

1,592+3%

Code Elo

High is better

1,542

Code EloHigh is better

1,568+2%

LiveBench

High is better

69.1%

LiveBenchHigh is better

71.4%+3%

SWE-bench

High is better

+2%70.4%

SWE-benchHigh is better

69.1%

GPQA

High is better

82%

GPQAHigh is better

84.6%+3%

TTFT

Low is better

+22%160 ms

TTFTLow is better

195 ms

Speed

High is better

+8%128 tok/s

SpeedHigh is better

118 tok/s

In $

Low is better

+100%$1/1M

In $Low is better

$2/1M

Out $

Low is better

$6/1M

Out $Low is better

$6/1M

Context

High is better

+110%1.1M

ContextHigh is better

500k

Interactive Simulator

Workload Cost & Savings Calculator

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

Save up to 22% with GPT-5.6 Terra

Monthly Volume50M tokens/mo

Quick Presets:

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

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

GPT-5.6 Terra$125.00 / mo

In: $35.00Out: $90.00

Grok 4.6$160.00 / mo

In: $70.00Out: $90.00

Estimated Cost Delta

GPT-5.6 Terra is estimated to save $35.00/month ($420/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

1
GPT-5.6 Terra:Pick GPT-5.6 Terra 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 agentsGPT-5.6 Terra

Higher SWE-bench (70.4%).

High-volume chatGPT-5.6 Terra

Lower output list price ($6/1M).

Voice / low-latency UIGPT-5.6 Terra

Lower TTFT (160 ms).

Long-document RAGGPT-5.6 Terra

Larger window (1.1M).

Screenshots / visionGrok 4.6

Both accept images. Defaulting to the higher-Elo side (Grok 4.6).

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	GPT-5.6 Terra	Higher SWE-bench (70.4%).
High-volume chat	GPT-5.6 Terra	Lower output list price ($6/1M).
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	Grok 4.6	Both accept images. Defaulting to the higher-Elo side (Grok 4.6).

Related Editorial Dispatches & Benchmark Notes

View all news

compareAug 12, 2026

Grok vs ChatGPT: price and Elo, not a personality contest

Brand hub remaps to top xAI vs top OpenAI. After Aug 12 that is Grok 4.6 vs Sol.

launchAug 12, 2026

Grok 4.6 (Aug 12): post-training refresh, same $2/$6 list

xAI’s Aug 12 2026 refresh of Grok 4.5. 500k context. The Grok vs ChatGPT hub remaps here.

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.

launchJul 10, 2025

Grok 4 remains the previous xAI flagship on this catalog

2025-07 row. 4.6 is the buy. We keep 4 so upgrade pairs and old inbound links resolve.

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LIVE

OpenAI

GPT-5.6 Terra

Elo 1,548

LiveBench69.1%

SWE-bench70.4%

Speed128 tok/s

Output cost$6/1M

xAI

Grok 4.6

Elo 1,592

LiveBench71.4%

SWE-bench69.1%

Speed118 tok/s

Output cost$6/1M

Frequently Asked Questions

Which is better overall, GPT-5.6 Terra or Grok 4.6?: Grok 4.6 has the higher preference Elo in our latest snapshot (1,592). “Better” still depends on coding, price, and latency — see the table.
Which is better at coding, GPT-5.6 Terra or Grok 4.6?: GPT-5.6 Terra leads SWE-bench at 70.4% vs 69.1%. SWE-bench is one harness, not your repo.
Which is cheaper to run in production?: GPT-5.6 Terra output tokens are $6/1M versus $6/1M. Input prices and retry rates still move the real bill.
Which is faster, GPT-5.6 Terra or Grok 4.6?: GPT-5.6 Terra has the lower time-to-first-token (160 ms vs 195 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 500k.
Can I self-host either model?: Neither model is marked open-weights here. You are comparing hosted APIs.
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. GPT-5.6 Terra and Grok 4.6 Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Similar Head-to-Head Comparisons

All GPT-5.6 Terra matchups →|All Grok 4.6 matchups →

Grok 4.6 vs Grok 4 (previous grok)GPT-4.5 Orion vs GPT-5.6 Terra GPT-5 vs GPT-5.6 Terra GPT-5.6 Sol vs Grok 4.6 OpenAI: o3 Mini vs GPT-5.6 Terra OpenAI: o1 vs GPT-5.6 Terra

GPT-5.6 Terra vs Grok 4.6 benchmark

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

GPT-5.6 Terra (5)vsGrok 4.6 (4)

GPT-5.6 Terra: 5W (56%)Overall: GPT-5.6 TerraGrok 4.6: 4W (44%)

← GPT-5.6 Terra1 tiesGrok 4.6 →

Grok 4.6 (4/5)

Intelligence & Reasoning

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

Preference Elo

1,548vs1,592

Coding Elo

1,542vs1,568

SWE-bench

70.4%vs69.1%

LiveBench

69.1%vs71.4%

GPQA Diamond

82%vs84.6%

GPT-5.6 Terra: 1WGrok 4.6: 4W

GPT-5.6 Terra (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

128 tok/svs118 tok/s

Time to first token

160 msvs195 ms

GPT-5.6 Terra: 2WGrok 4.6: 0W

GPT-5.6 Terra (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$6/1Mvs$6/1M

Input price

$1/1Mvs$2/1M

Context window

1.1Mvs500k

GPT-5.6 Terra: 2WGrok 4.6: 0W

Recommended Workload Routing

Repo / coding agentsGPT-5.6 Terra

Higher SWE-bench (70.4%).

High-volume chatGPT-5.6 Terra

Lower output list price ($6/1M).

Voice / low-latency UIGPT-5.6 Terra

Lower TTFT (160 ms).

Long-document RAGGPT-5.6 Terra

Larger window (1.1M).

Screenshots / visionGrok 4.6

Both accept images. Defaulting to the higher-Elo side (Grok 4.6).

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	GPT-5.6 Terra	Higher SWE-bench (70.4%).
High-volume chat	GPT-5.6 Terra	Lower output list price ($6/1M).
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	Grok 4.6	Both accept images. Defaulting to the higher-Elo side (Grok 4.6).

Frequently Asked Questions

Which is better overall, GPT-5.6 Terra or Grok 4.6?

Grok 4.6 has the higher preference Elo in our latest snapshot (1,592). “Better” still depends on coding, price, and latency — see the table.

Which is better at coding, GPT-5.6 Terra or Grok 4.6?

GPT-5.6 Terra leads SWE-bench at 70.4% vs 69.1%. SWE-bench is one harness, not your repo.

Which is cheaper to run in production?

GPT-5.6 Terra output tokens are $6/1M versus $6/1M. Input prices and retry rates still move the real bill.

Which is faster, GPT-5.6 Terra or Grok 4.6?

GPT-5.6 Terra has the lower time-to-first-token (160 ms vs 195 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 500k.

Can I self-host either model?

Neither model is marked open-weights here. You are comparing hosted APIs.

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. GPT-5.6 Terra and Grok 4.6 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

Grok 4.6

GPT-5.6 Terra

GPT-5.6 Terra

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Grok vs ChatGPT: price and Elo, not a personality contest

Grok 4.6 (Aug 12): post-training refresh, same $2/$6 list

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

Grok 4 remains the previous xAI flagship on this catalog

Cast Your Matchup Vote

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CompareLLM Matrix

GPT-5.6 Terra

Grok 4.6

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

Grok 4.6

GPT-5.6 Terra

GPT-5.6 Terra

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Grok vs ChatGPT: price and Elo, not a personality contest

Grok 4.6 (Aug 12): post-training refresh, same $2/$6 list

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

Grok 4 remains the previous xAI flagship on this catalog

Cast Your Matchup Vote

Community Discussions (0)

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CompareLLM Matrix

GPT-5.6 Terra

Grok 4.6

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons