GPT Chat Latest vs Sonar Deep Research
Updated October 21, 2026. No benchmark has tested both models yet. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
- Coding
- No data
- Overall
- No data
- Output $/M
- $30.00
- Coding
- No data
- Overall
- No data
- Output $/M
- $8.00
Decision reading
Neither model has a coding score yet, so the two cannot be ranked on coding.
GPT Chat Latest has the edge where the context window is larger, 400K against 128K 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 128K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Sonar Deep Research
GPT Chat Latest $0.020, Sonar Deep Research $0.0060 per turn.
List prices
At a glance
- Coding index
- GPT Chat Latest not benchmarked, Sonar Deep Research 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 Sonar Deep Research $8.00 per million output tokens, 3.8x apart.
- Context window
- GPT Chat Latest takes 400K tokens, Sonar Deep Research 128K.
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
Sonar Deep Research costs less
Repository review
50K input + 3K output tokens
Sonar Deep Research costs less
Agent loop
200K input + 10K output tokens
Sonar Deep Research 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 | Perplexity Sonar Deep Research |
|---|---|---|
| Maker | OpenAI | Perplexity |
| Weights | No public weights listed | No public weights listed |
| Released | May 5, 2026 | March 7, 2025 |
| Context window | 400K | 128K |
| Input $/Mtok | $5.00 | $2.00 |
| Output $/Mtok | $30.00 | $8.00 |
| 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 Sonar Deep Research for coding?
Neither model has a coding score yet, so the two cannot be ranked on coding. GPT Chat Latest has the edge where the context window is larger, 400K against 128K tokens.
Which is cheaper, GPT Chat Latest or Sonar Deep Research?
GPT Chat Latest costs $5.00 per million input tokens and $30.00 per million output tokens; Sonar Deep Research costs $2.00 and $8.00. Cost per solved task is known for neither of them.
Which has the bigger context window, GPT Chat Latest or Sonar Deep Research?
GPT Chat Latest, with 400K tokens against 128K.
Has any benchmark tested both GPT Chat Latest and Sonar Deep Research?
No benchmark has tested either model yet, so price and context are the only way to compare them. Data as of October 21, 2026.