MODEL VERSIONS ON THIS PAGE HAVE MOVED — CHECKED 8 OCTOBER 2026
Current line, with published API pricing per million tokens:
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OpenAI — GPT-6 Sol (paid ChatGPT), GPT-6 Luna ($0.10 / $0.50), GPT-6.1 Sol ($2.00 / $10.00), GPT-6 Astra
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Anthropic — Claude Opus 5.5, Sonnet 5.5 ($2.00 / $10.00), Haiku 5.5 ($0.10 / $0.50 below 100K), Fable 5.1
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xAI — Grok 4.3 ($1.25 / $2.50), Grok 4.7 ($2.00 / $6.00)
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Google — Gemini 3.5 Flash-Lite ($0.30 / $2.50), Gemini 3.8 Flash ($0.75 / $3.75 to 31 Dec), Gemini 4 Argon
The comparison below is kept because the reasoning still holds — how these tiers trade price against capability has not changed. The version numbers and prices have.
Current pricing table →
QUICK VERDICT — JULY 22, 2026
● Better benchmark (Terminal-Bench 2.1): GPT-5.6 Terra at 87.1% — 3.6 Flash score not published on this benchmark
● Better price: Gemini 3.6 Flash — $1.50/$7.50/M vs Terra's $2.50/$15/M
● Faster output: Gemini 3.6 Flash — 304 tok/s vs Terra's ~100 tok/s
● Token efficiency: Gemini 3.6 Flash — 17% fewer output tokens per agentic task
● Computer Use: Gemini 3.6 Flash built in — Terra requires separate tooling
● Context: 3.6 Flash 1M vs Terra 1.05M — marginal difference
● Default recommendation: 3.6 Flash for speed and cost-sensitive pipelines. Terra for broad software engineering where Terminal-Bench lead matters.
Full Comparison Table
| Model | Input /1M | Output /1M | Context | Speed | Terminal-Bench 2.1 |
|---|
| Gemini 3.6 Flash | $1.50 | $7.50 | 1M | 304 tok/s | Not published |
| GPT-5.6 Terra | $2.50 | $15 | 1.05M | ~100 tok/s | 87.1% |
Which to Choose
Gemini 3.6 Flash: High-throughput agentic pipelines needing speed, multimodal tasks with Computer Use, cost-sensitive production at scale. 40% cheaper input, 50% cheaper output, 3x faster.
GPT-5.6 Terra: Broad software engineering tasks where Terminal-Bench 2.1 matters (87.1%), OpenAI ecosystem integrations, and workloads where you have already benchmarked Terra on your specific tasks.
Last updated July 22, 2026. Related: Gemini 3.6 Flash vs Claude Sonnet 5 → · GPT-5.6 Sol vs Terra vs Luna → · Gemini 3.6 Flash full review →