GPT Chat Latest vs Perceptron Mk1.5
Perceptron Mk1.5 costs 20.0x less per output token than GPT Chat Latest ($1.50 vs $30.00 per million). Updated October 22, 2026; no benchmark has tested both models yet.
- Coding
- No data
- Overall
- No data
- Output $/M
- $30.00
- Coding
- No data
- Overall
- No data
- Output $/M
- $1.50
GPT Chat Latest or Perceptron Mk1.5: which to pick
Neither model has a coding score yet, so the two cannot be ranked on coding.
Pick GPT Chat Latest for a larger context window (400K against 37K tokens).
No benchmark has tested either model yet, so price and context are the only way to compare them.
Which one for your work
Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.
Coding
Vibe Coding Index, six public coding benchmarks
No call
Neither has a coding score yet.
One side not measured
Long documents
Listed context window
GPT Chat Latest
GPT Chat Latest takes 400K tokens against 37K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Perceptron Mk1.5
GPT Chat Latest $0.020, Perceptron Mk1.5 $0.0009 per turn.
List prices
At a glance
- Coding index
- GPT Chat Latest not benchmarked, Perceptron Mk1.5 not benchmarked.
- Widest category
- None yet: no category has been tested on both models.
- Widest single gap
- None yet: no benchmark has tested both models.
- Output price
- GPT Chat Latest $30.00 against Perceptron Mk1.5 $1.50 per million output tokens, 20.0x apart.
- Context window
- GPT Chat Latest takes 400K tokens, Perceptron Mk1.5 37K.
Benchmark by benchmark
Every board either model has a result on, a category to a fold; bars are each result on a 0 to 100 scale. Only one model is measured on each, so no row names a leader.
What each workload costs
Three fixed token mixes at each model's listed price, so per-token rates become a bill.
Chat turn
1K input + 500 output tokens
Perceptron Mk1.5 costs less
Repository review
50K input + 3K output tokens
Perceptron Mk1.5 costs less
Agent loop
200K input + 10K output tokens
Perceptron Mk1.5 costs less
Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.
Specification differences
The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.
| Specification | OpenAI GPT Chat Latest | Perceptron Mk1.5 |
|---|---|---|
| Maker | OpenAI | Perceptron |
| Weights | No public weights listed | No public weights listed |
| Released | May 5, 2026 | September 25, 2026 |
| Context window | 400K | 37K |
| Input $/Mtok | $5.00 | $0.15 |
| Output $/Mtok | $30.00 | $1.50 |
| Coding index | Not benchmarked | Not benchmarked |
| Independent measurements behind it | 0 | 0 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is GPT Chat Latest better than Perceptron Mk1.5 for coding?
Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GPT Chat Latest for a larger context window (400K against 37K tokens).
Which is cheaper, GPT Chat Latest or Perceptron Mk1.5?
GPT Chat Latest costs $5.00 per million input tokens and $30.00 per million output tokens; Perceptron Mk1.5 costs $0.15 and $1.50. Cost per solved task is known for neither of them.
Which has the bigger context window, GPT Chat Latest or Perceptron Mk1.5?
GPT Chat Latest, with 400K tokens against 37K.
Has any benchmark tested both GPT Chat Latest and Perceptron Mk1.5?
No benchmark has tested either model yet, so price and context are the only way to compare them. Data as of October 22, 2026.