Is GPT-5.4 Pro better than GPT-6.1 Terra?

GPT-5.4 Pro and GPT-6.1 Terra (max) are neck and neck on quality (63.2 vs 65.9, within the ±7.9 margin). The BenchLeader Index combines every independent quality benchmark; the two are within the margin of error as of 2026-10-27, so check the category scores for your use.

Which is cheaper, GPT-5.4 Pro or GPT-6.1 Terra, and will that change?

GPT-6.1 Terra is cheaper today: $2.00 against $67.50 per million tokens, blended at three input tokens per output token. No price change has been announced for either.

Which is better for long documents?

Both accept 1,050,000 tokens of context.

When was GPT-6.1 Terra released?

GPT-6.1 Terra was released on 26 Oct 2026.

GPT-5.4 Pro vs GPT-6.1 Terra

Full profiles: GPT-5.4 Pro (OpenAI) and GPT-6.1 Terra (OpenAI): every benchmark, price and rank.

Updated 27 Oct 2026 · Data from 5 sources

As of 27 Oct 2026, GPT-5.4 Pro and GPT-6.1 Terra (max) are neck and neck on quality (63.2 vs 65.9 on the BenchLeader Index, inside the ±7.9 margin of error), and GPT-6.1 Terra (max) costs 34× less, which makes it the better buy for most workloads. Pick GPT-5.4 Pro for multimodal (70 vs 68); pick GPT-6.1 Terra for reasoning (86 vs 73).

GPT-5.4 Pro benchmarks OpenAI

GPT-6.1 Terra benchmarks max OpenAI Open in the comparison tool

Which to pick for…

The pick's numbers come first. Category scores on the BenchLeader scale (50 is the average model, 15 points one standard deviation). High confidence means a lead of half a standard deviation or more; under one point is called either.

Use case	Pick	Why	Confidence
Reasoning	GPT-6.1 Terra	86 vs 73 category score	High
Knowledge	Either	74 vs 75 category score	Either
Images and other media	GPT-5.4 Pro	70 vs 68 category score	Medium
Lowest cost	GPT-6.1 Terra	$2.00 vs $67.50 per 1M blended; agentic coding session $0.080 vs $2.52	–
High volume on a budget	Neither flagship	A smaller model is usually the better fit: Cheapest good LLMs, Fastest LLMs	–

Key differences

GPT-5.4 Pro and GPT-6.1 Terra (max) are neck and neck on quality (63.2 vs 65.9, within the ±7.9 margin).
GPT-5.4 Pro is stronger in instruction following, multimodal.
GPT-6.1 Terra (max) is stronger in knowledge, reasoning, composite, long context.
GPT-6.1 Terra (max) is 34× cheaper ($2.00 vs $67.50 per 1M blended).

At a glance

Spec	GPT-5.4 Pro	GPT-6.1 Terra
Developer	OpenAI	OpenAI
Released	4 Mar 2026	26 Oct 2026
Context window (tokens)	1,050,000	1,050,000
Compared at	GPT-5.4 Pro	GPT-6.1 Terra (max)
Open weights	No	No
Price in / out / cached input per 1M	$30.00 / $180.00 / –	$1.00 / $5.00 / $0.050

Category by category

Category scores on the BenchLeader scale: 50 is the average evaluated model, 15 points is one standard deviation. A gap under one point is called level.

Category	GPT-5.4 Pro	GPT-6.1 Terra (max)	Leader
Reasoning	72.5	86.2	GPT-6.1 Terra
Knowledge	73.6	74.5	level
Instruction following	63.2	–	not comparable
Multimodal	69.8	67.5	GPT-5.4 Pro
Long context	–	66.3	not comparable
Composite	–	82.8	not comparable

Where sources disagree

Across the 0 benchmarks both have, GPT-5.4 Pro leads 0, GPT-6.1 Terra leads 0.

Overall index	GPT-5.4 Pro	GPT-6.1 Terra (max)	Leader
BenchLeader Index	63.2	65.9	neck and neck

Each publisher runs its own tasks, harnesses and effort settings, so their overall verdicts can differ; BenchLeader reconciles them on one scale. † measured at another effort setting of the same model (the publisher did not test the one compared here).

Price, speed and latency

List prices blended at three input tokens per output token. Per-task prices use the token counts on the methodology page; suite cost is what Artificial Analysis paid to run its whole Intelligence Index.

Measure	GPT-5.4 Pro	GPT-6.1 Terra (max)
Blended price per 1M tokens	$67.50	$2.00
Input / output per 1M	$30.00 / $180.00	$1.00 / $5.00
Cached input per 1M	–	$0.050
Price per task: chat reply	$0.066	$0.0019
Price per task: summarize a 30-page report	$0.468	$0.015
Price per task: code edit	$0.450	$0.013
Price per task: agentic coding session	$2.52	$0.080
Price per task: structured extraction	$0.096	$0.0030
Cost to run a full benchmark suite	–	$0.403
Output speed	–	91 tok/s
Time to first answer	–	131.8 s
Time to a complete answer	–	137.3 s

Each model is compared at its best-ranked reasoning-effort setting. GPT-5.4 Pro scores 63.2; GPT-5.4 Pro (xhigh) scores 61.8. GPT-6.1 Terra (max) scores 65.9 and takes 132 s to its first answer token; GPT-6.1 Terra (xhigh) scores 65.0 in 18 s, GPT-6.1 Terra (high) scores 64.7 in 7 s. Higher effort means more thinking before the answer: better scores, longer waits and more tokens billed. How reasoning effort changes scores and cost.

Every benchmark

41 benchmarks, grouped by category; each name links to the board and its leaders. † measured at another effort setting of the same model, shown for reference and not counted as a win.

Metric	Publisher	GPT-5.4 Pro	GPT-6.1 Terra (max)
BenchLeader Index	BenchLeader	63.2	65.9
Instruction following score	BenchLeader	63.2	–
Knowledge score	BenchLeader	73.6	74.5
Multimodal score	BenchLeader	69.8	67.5
Reasoning score	BenchLeader	72.5	86.2
Composite score	BenchLeader	–	82.8
Long context score	BenchLeader	–	66.3
Blended price $/M	BenchLeader	$67.50	$2.00
Output speed	BenchLeader	–	91 tok/s
Time to first answer	BenchLeader	–	131.8 s
Context window	BenchLeader	1,050,000 tokens	1,050,000 tokens
Reasoning
GPQA Diamond	Epoch AI Benchmarking Hub	94.6%†	–
Humanity's Last Exam	Scale AI / CAIS	44.3%	–
SimpleBench	SimpleBench	74.1%	–
LiveBench 2.0 Reasoning	LiveBench	–	88.7%†
Humanity's Last Exam (AA)	Artificial Analysis	–	46.3%
ARC-AGI-1	ARC Prize	94.5%†	–
ARC-AGI-2	ARC Prize	83.3%†	–
CritPt	Artificial Analysis	30.0%†	28.0%
Chess Puzzles	Epoch AI Benchmarking Hub	59.0%†	–
Coding
WeirdML	WeirdML	57.4%†	–
LiveBench 2.0 Coding	LiveBench	–	90.8%†
SciCode (AA)	Artificial Analysis	–	55.1%
Terminal-Bench 4.0 (AA)	Artificial Analysis	–	55.6%
FrontierCode 1.1 (AA)	Artificial Analysis	–	36.0%
Agents & tools
LiveBench Long Agentic	LiveBench	–	48.6%†
LiveBench Browser	LiveBench	–	93.1%†
AutomationBench	Artificial Analysis	–	60.2%
GDP.pdf (AA)	Artificial Analysis	–	28.6%
AA-Briefcase v1.1	Artificial Analysis	–	1402
Terminal-Bench-Science 0.1 (AA)	Artificial Analysis	–	57.6%
Maths
FrontierMath Tiers 1–3	Epoch AI Benchmarking Hub	82.5%†	–
FrontierMath Tier 4	Epoch AI Benchmarking Hub	58.5%†	–
MathArena Apex	MathArena	69.8%†	–
Knowledge
SimpleQA Verified	Epoch AI Benchmarking Hub	46.3%†	–
LiveBench 2.0 Data Analysis	LiveBench	–	82.3%†

Show all 41 benchmarks

Metric	Publisher	GPT-5.4 Pro	GPT-6.1 Terra (max)
Knowledge
LiveBench Research	LiveBench	–	73.9%†
AA-Omniscience	Artificial Analysis	–	29.8
MultiNRC	Scale AI SEAL	62.3%	–
AA-Omniscience: accuracy	Artificial Analysis	–	49.1%
AA-Omniscience: non-hallucination	Artificial Analysis	–	62.0%
Instruction following
MultiChallenge	Scale AI SEAL	69.2%	–
TutorBench	Scale AI SEAL	56.6%	–
Multimodal
LiveBench Design	LiveBench	–	82.3%†
MMMU-Pro	Artificial Analysis	–	84.7%
VISTA	Scale AI SEAL	53.9%	–
Long context
AA-LCR	Artificial Analysis	–	82.7%
Composite
Epoch Capabilities Index	Epoch AI Benchmarking Hub	159.6	–
LiveBench 2.0	LiveBench	–	77.2%†
AA Intelligence Index v4.3.2	Artificial Analysis	–	48.1
Safety & honesty
FORTRESS	Scale AI SEAL	14.8%	18.2%†
MASK	Scale AI SEAL	91.7%	–

Data as of 2026-10-27. Best configuration of each model; every score links to its source on the model pages.

What changed

21 Oct 2026 GPT-5.4 Pro: 1 score revision.
11 Oct 2026 GPT-5.4 Pro: BenchLeader Index 62.1 → 63.6.
11 Oct 2026 GPT-5.4 Pro: 1 new result (MultiNRC).
10 Oct 2026 GPT-5.4 Pro: BenchLeader Index 64.0 → 62.1.
6 Oct 2026 GPT-5.4 Pro: BenchLeader Index 63.4 → 64.0.
6 Oct 2026 GPT-5.4 Pro: 1 new result (TutorBench).
5 Oct 2026 GPT-5.4 Pro: BenchLeader Index 64.0 → 63.4.
3 Oct 2026 GPT-5.4 Pro: BenchLeader Index 62.6 → 64.0.
3 Oct 2026 GPT-5.4 Pro: 1 new result (MultiChallenge).
2 Oct 2026 GPT-5.4 Pro: 1 new result (MultiNRC).

Rankings: Best LLM overall · Best LLM for agents · Best cheap LLMs