Standard Compute
Model Comparison 2026

GPT-5.4 vs GPT-5.6 Terra

GPT-5.4
OpenAI · Balanced · Proprietary
$6.25/1M · 1.1M ctx
GPT-5.6 Terra
OpenAI · Balanced · Proprietary
$3.13/1M · 1.1M ctx

Community Vote

Pick a winner in each dimension — change your vote anytime. 11 votes cast so far.

Output Quality
Correctness and depth of what it produces
GPT-5.4 67%33% Terra
Agentic Ability
Tool calls, instruction-following, and multi-step tasks
GPT-5.4 0%100% Terra
Speed
Tokens per second and time-to-first-token
GPT-5.4 50%50% Terra
Value for $
How much capability you get per dollar
GPT-5.4 0%100% Terra
Reliability
Consistent results — fewer refusals, loops, and format breaks

Specs & Pricing, Side by Side

Spec
GPT-5.4
Terra
Maker
OpenAI
OpenAI
Blended price / 1M
$6.25
$3.13
Input / output
$2.50 in · $15 out / 1M tokens
$1.25 in · $7.50 out / 1M tokens
Context window
1.1M
1.1M
Open weights
No
No
Tool use
Yes
Yes
Reasoning
Yes
Yes
Output Quality
9.2
9.0
Agentic Ability
9.1
9.0
Speed
7.6
8.4
Value for $
8.1
8.8
Reliability
8.6
9.2

Pricing and capabilities synced from the OpenRouter catalogue. Scores are editorial (0–10).

Verdict: GPT-5.4 or Terra?

Updated 2026-08-02

Choose GPT-5.4 if you want the OpenAI daily driver — strong and well-priced. Choose GPT-5.6 Terra if you want the everyday OpenAI default for agents — volume work with frontier-adjacent quality.

In our editorial scoring, GPT-5.6 Terra leads in 3 of five dimensions (speed, value for $ and reliability), while GPT-5.4 leads in 2. On price, GPT-5.4 runs about $6.25 per 1M tokens (blended) and is proprietary; GPT-5.6 Terra is about $3.13 and proprietary.

Across 11 community votes on this matchup, GPT-5.6 Terra currently leads in 2 of five dimensions. Cast your own vote above to move the needle.

Where GPT-5.4 falls short
  • A notch below 5.5 on the hardest tasks
  • Still pricier than open models
Full GPT-5.4 breakdown →
Where Terra falls short
  • Steps behind Sol on the hardest tasks
  • Very new — long-run agent behavior still being characterized
Full Terra breakdown →

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