Compare AI Models Side by Side

Pick 2 to 4 models to compare benchmark scores, pricing, and specs in 2026.

GPT-6 Astra
GPT-5.6 Sol
Kimi K3.1 Pro
OpenAI
GPT-6 Astra

OpenAI · GPT

OpenAI
GPT-5.6 Sol

OpenAI · GPT

Moonshot AI
Kimi K3.1 Pro

Moonshot AI · Kimi

Specifications

Spec
GPT-6 Astra
GPT-5.6 Sol
Kimi K3.1 Pro
ProviderOpenAIOpenAIMoonshot AI
FamilyGPTGPTKimi
Release date2026-09-032026-07-092026-10-23
Open sourceNoNoNo
Context window1.1M tokens1.1M tokens1.0M tokens
Max output128K tokens128K tokens--
Input price / MTok$10.00*$4.00*$2.00*
Output price / MTok$50.00*$20.00*$10.00*
Speed----73.5 tok/s
Best foragents, coding, researchcoding, agents, reasoningcoding, agents, reasoning

* GPT-6 Astra: Cached input $1/MTok, cache writes $12.50/MTok. Prompts over 272K input tokens are billed at 2x the input/cache rates and 1.5x the output rate for the entire request, not just the excess. | GPT-5.6 Sol: OpenAI cut pricing from launch $5/$30 to $4/$20 per MTok on Aug 21 2026, a promotion running at least through Nov 21 2026. Prompts over 272K input tokens are billed at 2x the input/cache rates and 1.5x the output rate for the entire request, not just the excess; cache writes are 1.25x the uncached input rate. | Kimi K3.1 Pro: Kimi API (model ID kimi-k3.1-pro): cached input $0.20/MTok, cache writes $2 (5 min) / $4 (1 h). kimi-k3.1-pro-highspeed (2-3x faster): $4/$20. Unlocked after a $1 minimum top-up. Source: platform.kimi.ai/docs/pricing/chat, checked 2026-10-25.

Benchmark scores (% of max)

Scores normalized to percentage of each benchmark's maximum reported value. Only officially reported scores are included.

Cost per million tokens (USD)

Context window (thousands of tokens)

Output speed (tokens per second)

Notes

GPT-6 Astra: Ships with web search, code interpreter, a hosted shell, apply-patch, computer use, and MCP support built in. Staged rollout starting with a limited partner preview Sep 3 2026, then ChatGPT Plus/Pro/Business/Enterprise plus the API and AWS over the following days. First OpenAI model to hit the 'Critical' cybersecurity threshold under the company's own Preparedness Framework; its most advanced cyber capabilities are gated behind the enterprise-only 'Daybreak' program rather than shipped broadly. Fortune reported OpenAI quietly revised some evaluation metrics upward after a delayed publication of the launch announcement, a credibility flag independent of the ARC-AGI-3 discrepancy above. Strongest, most independently-corroborated advantage across hands-on reviews is cost/token efficiency on agentic coding and robotics tasks rather than raw intelligence; the cross-vendor Artificial Analysis index and Humanity's Last Exam both still favor Claude Fable 5.1 and Opus 5. API identifier gpt-6-astra, knowledge cutoff Apr 30 2026.
GPT-5.6 Sol: Flagship of OpenAI's GPT-5.6 family (Sol/Terra/Luna tiers), announced as a limited preview Jun 26 2026 with general availability Jul 9 2026. Strong on long-horizon, command-line, and multi-step coding tasks. On the independent ARC-AGI-3 public set, OpenAI reported the official-harness score understates it: enabling retained reasoning and compaction lifted the result from 13.3% to 38.3%, beating Claude Opus 5's 30.2% on the same set — a real, reproducible optimization rather than a benchmark discrepancy, but flagged here since the two settings are not on by default. API identifier gpt-5.6-sol, knowledge cutoff Feb 16 2026. Superseded as OpenAI's flagship by GPT-6 Astra (Sep 3 2026).
Kimi K3.1 Pro: Post-trained version of Kimi K3 (2.8T total / 104B active MoE). Always-on thinking with reasoning_effort low/high/max (default max). Text, image and video input. Moonshot says full weights ship by Nov 4 2026; until then it is API-only, so openSource is false. Cyber-related training data is removed from the open-weight release.
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GPT-6 Astra vs GPT-5.6 Sol vs Kimi K3.1 Pro | AI Model Comparison