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GPT-5.5 Pro vs Ternary Bonsai 2 27B

Ternary Bonsai 2 27B costs 360.0x less per output token than GPT-5.5 Pro ($0.50 vs $180.00 per million). Updated October 22, 2026; no benchmark has tested both models yet.

Replace GPT-5.5 Pro Replace Ternary Bonsai 2 27B
GPT-5.5 ProOpenAI
Coding
No data
Overall
No data
Output $/M
$180.00
P Ternary Bonsai 2 27BPrism-ml
Coding
No data
Overall
No data
Output $/M
$0.50
vs $180.00 vs $0.50 per 1M output tokens. Ternary Bonsai 2 27B is 360.0x cheaper.

GPT-5.5 Pro or Ternary Bonsai 2 27B: which to pick

Neither model has a coding score yet, so the two cannot be ranked on coding.

Pick GPT-5.5 Pro for a larger context window (1.05M against 262K tokens).

Model AGPT-5.5 ProOpenAINot benchmarkedNo coding benchmarkNo cost per solved taskModel BTernary Bonsai 2 27BPrism-mlNot benchmarkedNo coding benchmarkNo cost per solved task

No benchmark has tested both yet. GPT-5.5 Pro has results on Epoch Capabilities Index, ARC-AGI and ARC-AGI-2; Ternary Bonsai 2 27B has none yet. Compare them on price and context instead.

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.

At a glance

Coding index
GPT-5.5 Pro not benchmarked, Ternary Bonsai 2 27B 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-5.5 Pro $180.00 against Ternary Bonsai 2 27B $0.50 per million output tokens, 360.0x apart.
Context window
GPT-5.5 Pro takes 1.05M tokens, Ternary Bonsai 2 27B 262K.

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.

IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
Intelligence benchmarks for GPT-5.5 Pro and Ternary Bonsai 2 27B
BenchmarkGPT-5.5 ProTernary Bonsai 2 27BLeader
Epoch Capabilities Index162.9Not measuredOnly GPT-5.5 Pro measured
Neither model has a result on the other 1 board here
ReasoningDirectional onlyPublic boards, shown as published, kept out of the index4 boards measured
Reasoning benchmarks for GPT-5.5 Pro and Ternary Bonsai 2 27B
BenchmarkGPT-5.5 ProTernary Bonsai 2 27BLeader
ARC-AGI96.5%Not measuredOnly GPT-5.5 Pro measured
ARC-AGI-284.6%Not measuredOnly GPT-5.5 Pro measured
SimpleBench76.9%Not measuredOnly GPT-5.5 Pro measured
Chess puzzles62.0%Not measuredOnly GPT-5.5 Pro measured
Neither model has a result on the other 19 boards here
MathDirectional onlyPublic boards, shown as published, kept out of the index2 boards measured
Math benchmarks for GPT-5.5 Pro and Ternary Bonsai 2 27B
BenchmarkGPT-5.5 ProTernary Bonsai 2 27BLeader
FrontierMath, tiers 1 to 387.7%Not measuredOnly GPT-5.5 Pro measured
FrontierMath, tier 478.0%Not measuredOnly GPT-5.5 Pro measured
Neither model has a result on the other 12 boards here
GeneralDirectional onlyPublic boards, shown as published, kept out of the index2 boards measured
General benchmarks for GPT-5.5 Pro and Ternary Bonsai 2 27B
BenchmarkGPT-5.5 ProTernary Bonsai 2 27BLeader
DTBench96.0%Not measuredOnly GPT-5.5 Pro measured
LMCA53.9%Not measuredOnly GPT-5.5 Pro measured
Neither model has a result on the other 46 boards here

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

GPT-5.5 Pro$0.120Fits in one request
Ternary Bonsai 2 27B$0.0003Fits in one request

Ternary Bonsai 2 27B costs less

Repository review

50K input + 3K output tokens

GPT-5.5 Pro$2.04Fits in one request
Ternary Bonsai 2 27B$0.0053Fits in one request

Ternary Bonsai 2 27B costs less

Agent loop

200K input + 10K output tokens

GPT-5.5 Pro$7.80Fits in one request
Ternary Bonsai 2 27B$0.020Fits in one request

Ternary Bonsai 2 27B 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.

Specifications of GPT-5.5 Pro and Ternary Bonsai 2 27B
SpecificationOpenAI GPT-5.5 ProPrismML Ternary Bonsai 2 27B
MakerOpenAIPrism-ml
WeightsNo public weights listedOpen weights
ReleasedApril 24, 2026September 18, 2026
Context window1.05M262K
Input $/Mtok$30.00$0.075
Output $/Mtok$180.00$0.50
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.5 Pro better than Ternary Bonsai 2 27B for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GPT-5.5 Pro for a larger context window (1.05M against 262K tokens).

Which is cheaper, GPT-5.5 Pro or Ternary Bonsai 2 27B?

GPT-5.5 Pro costs $30.00 per million input tokens and $180.00 per million output tokens; Ternary Bonsai 2 27B costs $0.075 and $0.50. Cost per solved task is known for neither of them.

Which has the bigger context window, GPT-5.5 Pro or Ternary Bonsai 2 27B?

GPT-5.5 Pro, with 1.05M tokens against 262K.

Has any benchmark tested both GPT-5.5 Pro and Ternary Bonsai 2 27B?

No benchmark has tested both yet. GPT-5.5 Pro has results on Epoch Capabilities Index, ARC-AGI and ARC-AGI-2; Ternary Bonsai 2 27B has none yet. Compare them on price and context instead. Data as of October 22, 2026.

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